refactor: Update video element in Artplayer to support custom canvas or video

docs/assets/example/webav.js

@@ -0,0 +1,10 @@
+// npm i artplayer-proxy-webav
+// import artplayerProxyWebAV from 'artplayer-proxy-webav';
+
+var art = new Artplayer({
+    container: '.artplayer-app',
+    url: '/assets/sample/video.mp4',
+    proxy: artplayerProxyWebAV({
+        //
+    }),
+});