Does this still work? I just get an infinite "Unable to load the video. Try again?" with error code 2801-2803, even on DMs through Twitter.
Google Drive is working, though (I think because they use the Youtube player).
Do you mean over other websites? It's not possible unfortunately. Depending on the site, it may be possible to display it within an iframe, but not all sites support this.
I would also like to mention that whatever javascript code that those websites use literally disable the opening of the options menu when you click it somehow
