Chromium webview does not seems to work with Android applyOverrideConfiguration
For future; You can try my own implementation. Add below code to your CustomChromeClient;
@Nullable@Overridepublic Bitmap getDefaultVideoPoster() { if (super.getDefaultVideoPoster() == null) { return BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher); } else { return super.getDefaultVideoPoster(); }}