Drag the link to your shortcuts bar:
When you are on a page with a stream (or any flash player) click the bookmarklet and it will remove everything that is not a flash player from the page.
This doesn't work 100% of the time, but if it messes the page up all you have to do is refresh.
Update - May 4, 2014: Works with HTML5 video. Hides text and removes spacing from tables. Fixed for Internet Explorer.
Update - Apr 3, 2014: Now works with the WWE Network player.
Update - Apr 4, 2014: Now works with https sites (like youtube). You will need to re-add the bookmarklet (and get rid of the old one) for this update to take effect.