docs: added video track event (#2010)

www/docs/src/theme/Layout/index.js

@@ -0,0 +1,37 @@
+import React, { useEffect } from 'react';
+
+import Layout from '@theme-original/Layout';
+import useIsBrowser from '@docusaurus/useIsBrowser';
+import {useLocation} from '@docusaurus/router';
+
+export default function LayoutWrapper(props) {
+  
+  const isBrowser = useIsBrowser();
+  const location = useLocation();
+
+  useEffect(() => {
+    if (isBrowser) {
+      if (window.analytics) {
+        function handlePlay() {
+          window.analytics.track('video_played');
+        }
+
+        const videos = document.querySelectorAll('video');
+        videos.forEach((video) => video.addEventListener('play', handlePlay, {
+          once: true,
+          capture: true
+        }))
+  
+        return () => {
+          videos.forEach((video) => video.removeEventListener('play', handlePlay));
+        }
+      }
+    }
+  }, [isBrowser, location.pathname]);
+
+  return (
+    <>
+      <Layout {...props} />
+    </>
+  );
+}