diff --git a/.vscode/settings.json b/.vscode/settings.json
index b6c6bf6d..329f582d 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -177,6 +177,7 @@
     "Upvote",
     "Viewset",
     "viewsets",
+    "vkvideo",
     "wordform",
     "Wordforms",
     "XCSDATN",
diff --git a/rsconcept/frontend/src/app/global-dialogs.tsx b/rsconcept/frontend/src/app/global-dialogs.tsx
index bf40d824..d2d2981e 100644
--- a/rsconcept/frontend/src/app/global-dialogs.tsx
+++ b/rsconcept/frontend/src/app/global-dialogs.tsx
@@ -4,6 +4,9 @@ import React from 'react';
 
 import { DialogType, useDialogsStore } from '@/stores/dialogs';
 
+const DlgShowVideo = React.lazy(() =>
+  import('@/features/help/dialogs/dlg-show-video').then(module => ({ default: module.DlgShowVideo }))
+);
 const DlgChangeInputSchema = React.lazy(() =>
   import('@/features/oss/dialogs/dlg-change-input-schema').then(module => ({ default: module.DlgChangeInputSchema }))
 );
@@ -161,6 +164,8 @@ export const GlobalDialogs = () => {
     return null;
   }
   switch (active) {
+    case DialogType.SHOW_VIDEO:
+      return <DlgShowVideo />;
     case DialogType.CONSTITUENTA_TEMPLATE:
       return <DlgCstTemplate />;
     case DialogType.CREATE_CONSTITUENTA:
diff --git a/rsconcept/frontend/src/components/icons.tsx b/rsconcept/frontend/src/components/icons.tsx
index 1fb83dd0..aff85178 100644
--- a/rsconcept/frontend/src/components/icons.tsx
+++ b/rsconcept/frontend/src/components/icons.tsx
@@ -39,6 +39,7 @@ export { RiMenuFoldFill   as IconMenuFold }       from 'react-icons/ri';
 export { RiMenuUnfoldFill as IconMenuUnfold }     from 'react-icons/ri';
 export { LuMoon           as IconDarkTheme }      from 'react-icons/lu';
 export { LuSun            as IconLightTheme }     from 'react-icons/lu';
+export { IoVideocamOutline as IconVideo }         from 'react-icons/io5';
 export { LuFolderTree     as IconFolderTree }     from 'react-icons/lu';
 export { LuFolder         as IconFolder }         from 'react-icons/lu';
 export { LuFolderSearch   as IconFolderSearch }   from 'react-icons/lu';
diff --git a/rsconcept/frontend/src/components/view/embed-vkvideo.tsx b/rsconcept/frontend/src/components/view/embed-vkvideo.tsx
new file mode 100644
index 00000000..be5450b5
--- /dev/null
+++ b/rsconcept/frontend/src/components/view/embed-vkvideo.tsx
@@ -0,0 +1,42 @@
+interface EmbedVKVideoProps {
+  /** Video ID to embed. */
+  videoID: string;
+
+  /** Display height in pixels. */
+  pxHeight: number;
+
+  /** Display width in pixels. */
+  pxWidth?: number;
+}
+
+/**
+ * Embeds a YouTube video into the page using the given video ID and dimensions.
+ */
+export function EmbedVKVideo({ videoID, pxHeight, pxWidth }: EmbedVKVideoProps) {
+  if (!pxWidth) {
+    pxWidth = (pxHeight * 16) / 9;
+  }
+  return (
+    <div
+      className='relative h-0 mt-1'
+      style={{
+        paddingBottom: `${pxHeight}px`,
+        paddingLeft: `${pxWidth}px`
+      }}
+    >
+      <iframe
+        allowFullScreen
+        title='Встроенное видео ВКонтакте'
+        allow='autoplay; encrypted-media; fullscreen; picture-in-picture; screen-wake-lock;'
+        className='absolute top-0 left-0 border'
+        style={{
+          minHeight: `${pxHeight}px`,
+          minWidth: `${pxWidth}px`
+        }}
+        width={`${pxWidth}px`}
+        height={`${pxHeight}px`}
+        src={`https://vk.com/video_ext.php?${videoID}&hd=1`}
+      />
+    </div>
+  );
+}
diff --git a/rsconcept/frontend/src/features/help/components/badge-video.tsx b/rsconcept/frontend/src/features/help/components/badge-video.tsx
new file mode 100644
index 00000000..edb80178
--- /dev/null
+++ b/rsconcept/frontend/src/features/help/components/badge-video.tsx
@@ -0,0 +1,30 @@
+'use client';
+
+import { IconVideo } from '@/components/icons';
+import { type Styling } from '@/components/props';
+import { cn } from '@/components/utils';
+import { useDialogsStore } from '@/stores/dialogs';
+import { globalIDs, type IVideo } from '@/utils/constants';
+
+interface BadgeVideoProps extends Styling {
+  video: IVideo;
+}
+
+/** Displays a badge with a video icon to click and open the video. */
+export function BadgeVideo({ video, className, ...restProps }: BadgeVideoProps) {
+  const showVideo = useDialogsStore(state => state.showVideo);
+
+  function handleShowExplication() {
+    showVideo({ video: video });
+  }
+
+  return (
+    <IconVideo
+      className={cn('cursor-pointer', className)}
+      onClick={handleShowExplication}
+      data-tooltip-id={globalIDs.tooltip}
+      data-tooltip-content='Просмотр видео'
+      {...restProps}
+    />
+  );
+}
diff --git a/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/dlg-show-video.tsx b/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/dlg-show-video.tsx
new file mode 100644
index 00000000..a983e00c
--- /dev/null
+++ b/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/dlg-show-video.tsx
@@ -0,0 +1,64 @@
+'use client';
+
+import { TabList, TabPanel, Tabs } from 'react-tabs';
+
+import { ModalView } from '@/components/modal';
+import { TabLabel } from '@/components/tabs';
+import { useWindowSize } from '@/hooks/use-window-size';
+import { useDialogsStore } from '@/stores/dialogs';
+import { usePreferencesStore } from '@/stores/preferences';
+import { type IVideo } from '@/utils/constants';
+
+import { TabVK } from './tab-vk';
+import { TabYoutube } from './tab-youtube';
+
+export const TabID = {
+  VK: 0,
+  YOUTUBE: 1
+} as const;
+export type TabID = (typeof TabID)[keyof typeof TabID];
+
+export interface DlgShowVideoProps {
+  video: IVideo;
+}
+
+export function DlgShowVideo() {
+  const preferredPlayer = usePreferencesStore(state => state.preferredPlayer);
+  const setPreferredPlayer = usePreferencesStore(state => state.setPreferredPlayer);
+  const activeTab = preferredPlayer === 'vk' ? TabID.VK : TabID.YOUTUBE;
+  const { video } = useDialogsStore(state => state.props as DlgShowVideoProps);
+  const windowSize = useWindowSize();
+
+  const videoHeight = (() => {
+    const viewH = windowSize.height ?? 0;
+    const viewW = windowSize.width ?? 0;
+    const availableWidth = viewW - 80;
+    return Math.min(Math.max(viewH - 150, 300), Math.floor((availableWidth * 9) / 16));
+  })();
+
+  function setActiveTab(newTab: TabID) {
+    setPreferredPlayer(newTab === TabID.VK ? 'vk' : 'youtube');
+  }
+
+  return (
+    <ModalView fullScreen className='relative w-[calc(100dvw-3rem)] h-[calc(100dvh-3rem)]'>
+      <Tabs
+        className='flex flex-col gap-1 items-center pt-3'
+        selectedIndex={activeTab}
+        onSelect={index => setActiveTab(index as TabID)}
+      >
+        <TabList className='mx-auto flex border divide-x rounded-none'>
+          <TabLabel label='ВК Видео' className='w-32' />
+          <TabLabel label='Youtube' className='w-32' />
+        </TabList>
+
+        <TabPanel>
+          <TabVK videoHeight={videoHeight} videoID={video.vk} />
+        </TabPanel>
+        <TabPanel>
+          <TabYoutube videoHeight={videoHeight} videoID={video.youtube} />
+        </TabPanel>
+      </Tabs>
+    </ModalView>
+  );
+}
diff --git a/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/index.tsx b/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/index.tsx
new file mode 100644
index 00000000..9a4165cb
--- /dev/null
+++ b/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/index.tsx
@@ -0,0 +1 @@
+export { DlgShowVideo as DlgShowVideo } from './dlg-show-video';
diff --git a/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/tab-vk.tsx b/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/tab-vk.tsx
new file mode 100644
index 00000000..df039f20
--- /dev/null
+++ b/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/tab-vk.tsx
@@ -0,0 +1,10 @@
+import { EmbedVKVideo } from '@/components/view/embed-vkvideo';
+
+interface TabVKProps {
+  videoHeight: number;
+  videoID: string;
+}
+
+export function TabVK({ videoHeight, videoID }: TabVKProps) {
+  return <EmbedVKVideo videoID={videoID} pxHeight={videoHeight} />;
+}
diff --git a/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/tab-youtube.tsx b/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/tab-youtube.tsx
new file mode 100644
index 00000000..b092d697
--- /dev/null
+++ b/rsconcept/frontend/src/features/help/dialogs/dlg-show-video/tab-youtube.tsx
@@ -0,0 +1,10 @@
+import { EmbedYoutube } from '@/components/view';
+
+interface TabYoutubeProps {
+  videoHeight: number;
+  videoID: string;
+}
+
+export function TabYoutube({ videoHeight, videoID }: TabYoutubeProps) {
+  return <EmbedYoutube videoID={videoID} pxHeight={videoHeight} />;
+}
diff --git a/rsconcept/frontend/src/features/help/items/help-main.tsx b/rsconcept/frontend/src/features/help/items/help-main.tsx
index 8c04cd31..ca825b59 100644
--- a/rsconcept/frontend/src/features/help/items/help-main.tsx
+++ b/rsconcept/frontend/src/features/help/items/help-main.tsx
@@ -1,4 +1,5 @@
 import { TextURL } from '@/components/control';
+import { IconVideo } from '@/components/icons';
 import { external_urls, prefixes } from '@/utils/constants';
 
 import { LinkTopic } from '../components/link-topic';
@@ -11,7 +12,7 @@ export function HelpMain() {
       <h1>Портал</h1>
       <p>
         Портал позволяет анализировать предметные области, формально записывать системы определений и синтезировать их с
-        помощью математического аппарата <LinkTopic text='Родов структур' topic={HelpTopic.RSLANG} />
+        помощью математического аппарата <LinkTopic text='Родов структур' topic={HelpTopic.RSLANG} />.
       </p>
       <p>
         Такие системы называются <LinkTopic text='Концептуальными схемами' topic={HelpTopic.CC_SYSTEM} /> и состоят из
@@ -19,6 +20,10 @@ export function HelpMain() {
         определения. Концептуальные схемы могут связываться путем синтеза в{' '}
         <LinkTopic text='Операционной схеме синтеза' topic={HelpTopic.CC_OSS} />.
       </p>
+      <p>
+        Значок <IconVideo className='inline-icon' /> при нажатии отображает видео о различных темах и подробностях
+        работы Портала. Просмотр видео доступен на Youtube и ВКонтакте.
+      </p>
 
       <details>
         <summary className='text-center font-semibold'>Разделы Справки</summary>
diff --git a/rsconcept/frontend/src/features/help/items/help-rslang.tsx b/rsconcept/frontend/src/features/help/items/help-rslang.tsx
index 76c8176e..74acc476 100644
--- a/rsconcept/frontend/src/features/help/items/help-rslang.tsx
+++ b/rsconcept/frontend/src/features/help/items/help-rslang.tsx
@@ -1,21 +1,10 @@
-import { EmbedYoutube } from '@/components/view';
-import { useWindowSize } from '@/hooks/use-window-size';
-import { external_urls, youtube } from '@/utils/constants';
+import { external_urls, videos } from '@/utils/constants';
 
+import { BadgeVideo } from '../components/badge-video';
 import { Subtopics } from '../components/subtopics';
 import { HelpTopic } from '../models/help-topic';
 
 export function HelpRSLang() {
-  const windowSize = useWindowSize();
-  const isSmall = windowSize.isSmall;
-
-  const videoHeight = (() => {
-    const viewH = windowSize.height ?? 0;
-    const viewW = windowSize.width ?? 0;
-    const availableWidth = viewW - (isSmall ? 35 : 310);
-    return Math.min(1080, Math.max(viewH - 450, 300), Math.floor((availableWidth * 9) / 16));
-  })();
-
   // prettier-ignore
   return (
   <div className='flex flex-col gap-4'>
@@ -23,14 +12,10 @@ export function HelpRSLang() {
       <h1>Родоструктурная экспликация концептуальных схем</h1>
       <p>Формальная запись (<i>экспликация</i>) концептуальных схем осуществляется с помощью языка родов структур.</p>
       <p>Для ознакомления с основами родов структур можно использовать следующие материалы:</p>
-      <p>1. <a className='underline' href={external_urls.intro_video}>Видео: Краткое введение в мат. аппарат</a></p>
+      <p>1. <BadgeVideo className='inline-icon' video={videos.explication} /> Видео: Краткое введение в мат. аппарат</p>
       <p>2. <a className='underline' href={external_urls.ponomarev}>Текст: Учебник И. Н. Пономарева</a></p>
       <p>3. <a className='underline' href={external_urls.full_course}>Видео: лекции для 4 курса (второй семестр 2022-23 год)</a></p>
     </div>
-    <EmbedYoutube
-      videoID={youtube.intro}
-      pxHeight={videoHeight}
-    />
     <div className='dense'>
       <Subtopics headTopic={HelpTopic.RSLANG} />
     </div>
diff --git a/rsconcept/frontend/src/stores/dialogs.ts b/rsconcept/frontend/src/stores/dialogs.ts
index c2e559ca..30be21a3 100644
--- a/rsconcept/frontend/src/stores/dialogs.ts
+++ b/rsconcept/frontend/src/stores/dialogs.ts
@@ -1,6 +1,7 @@
 import { create } from 'zustand';
 
 import { type DlgCreatePromptTemplateProps } from '@/features/ai/dialogs/dlg-create-prompt-template';
+import { type DlgShowVideoProps } from '@/features/help/dialogs/dlg-show-video/dlg-show-video';
 import { type DlgChangeLocationProps } from '@/features/library/dialogs/dlg-change-location';
 import { type DlgCloneLibraryItemProps } from '@/features/library/dialogs/dlg-clone-library-item';
 import { type DlgCreateVersionProps } from '@/features/library/dialogs/dlg-create-version';
@@ -73,7 +74,9 @@ export const DialogType = {
   IMPORT_SCHEMA: 31,
 
   AI_PROMPT: 32,
-  CREATE_PROMPT_TEMPLATE: 33
+  CREATE_PROMPT_TEMPLATE: 33,
+
+  SHOW_VIDEO: 34
 } as const;
 export type DialogType = (typeof DialogType)[keyof typeof DialogType];
 
@@ -86,6 +89,7 @@ interface DialogsStore {
   props: unknown;
   hideDialog: () => void;
 
+  showVideo: (props: DlgShowVideoProps) => void;
   showCstTemplate: (props: DlgCstTemplateProps) => void;
   showCreateCst: (props: DlgCreateCstProps) => void;
   showCreateBlock: (props: DlgCreateBlockProps) => void;
@@ -131,6 +135,7 @@ export const useDialogsStore = create<DialogsStore>()(set => ({
     });
   },
 
+  showVideo: props => set({ active: DialogType.SHOW_VIDEO, props: props }),
   showCstTemplate: props => set({ active: DialogType.CONSTITUENTA_TEMPLATE, props: props }),
   showCreateCst: props => set({ active: DialogType.CREATE_CONSTITUENTA, props: props }),
   showCreateOperation: props => set({ active: DialogType.CREATE_SYNTHESIS, props: props }),
diff --git a/rsconcept/frontend/src/stores/preferences.ts b/rsconcept/frontend/src/stores/preferences.ts
index 6ef844d7..382a0924 100644
--- a/rsconcept/frontend/src/stores/preferences.ts
+++ b/rsconcept/frontend/src/stores/preferences.ts
@@ -4,6 +4,11 @@ import { persist } from 'zustand/middleware';
 
 import { PARAMETER } from '@/utils/constants';
 
+export const videoPlayerTypes = ['vk', 'youtube'] as const;
+
+/** Represents video player type. */
+export type VideoPlayerType = (typeof videoPlayerTypes)[number];
+
 interface PreferencesStore {
   darkMode: boolean;
   toggleDarkMode: () => void;
@@ -31,6 +36,9 @@ interface PreferencesStore {
 
   showOssSidePanel: boolean;
   toggleShowOssSidePanel: () => void;
+
+  preferredPlayer: VideoPlayerType;
+  setPreferredPlayer: (value: VideoPlayerType) => void;
 }
 
 export const usePreferencesStore = create<PreferencesStore>()(
@@ -66,7 +74,7 @@ export const usePreferencesStore = create<PreferencesStore>()(
       adminMode: false,
       toggleAdminMode: () => set(state => ({ adminMode: !state.adminMode })),
 
-      libraryPagination: 50,
+      libraryPagination: 20,
       setLibraryPagination: value => set({ libraryPagination: value }),
 
       showCstSideList: true,
@@ -82,10 +90,13 @@ export const usePreferencesStore = create<PreferencesStore>()(
       toggleShowExpressionControls: () => set(state => ({ showExpressionControls: !state.showExpressionControls })),
 
       showOssSidePanel: false,
-      toggleShowOssSidePanel: () => set(state => ({ showOssSidePanel: !state.showOssSidePanel }))
+      toggleShowOssSidePanel: () => set(state => ({ showOssSidePanel: !state.showOssSidePanel })),
+
+      preferredPlayer: 'vk',
+      setPreferredPlayer: value => set({ preferredPlayer: value })
     }),
     {
-      version: 1,
+      version: 2,
       name: 'portal.preferences'
     }
   )
diff --git a/rsconcept/frontend/src/utils/constants.ts b/rsconcept/frontend/src/utils/constants.ts
index 29497219..ca28a2a4 100644
--- a/rsconcept/frontend/src/utils/constants.ts
+++ b/rsconcept/frontend/src/utils/constants.ts
@@ -53,11 +53,6 @@ export const resources = {
   db_schema: '/db_schema.svg'
 } as const;
 
-/** Youtube IDs for embedding. */
-export const youtube = {
-  intro: '0Ty9mu9sOJo'
-} as const;
-
 /** External URLs. */
 export const external_urls = {
   concept: 'https://www.acconcept.ru/',
@@ -76,6 +71,23 @@ export const external_urls = {
   restAPI: 'https://api.portal.acconcept.ru'
 } as const;
 
+/** Youtube and VK IDs for embedding. */
+export interface IVideo {
+  /** Youtube ID. */
+  youtube: string;
+
+  /** VK ID. */
+  vk: string;
+}
+
+/** Youtube and VK IDs for embedding. */
+export const videos = {
+  explication: {
+    youtube: '0Ty9mu9sOJo',
+    vk: 'oid=-232112636&id=456239017'
+  }
+};
+
 /** Global element ID. */
 export const globalIDs = {
   tooltip: 'global_tooltip',