To enable the ViewTube script you go to that website and click on install. After that, you could go to youtube and you will be presented a screen similar to the one on that screenshot on the page: http://ompldr.org/vZDB0Mg
It may be choppy if you try to play the video via HTML5. It works fine if you play it in MP4/MPEG which basically calls the Totem player inside the window.
