Or at least any site with a <video> tag. It will be nice once the standard become ubiquitous. Until then <video> causes decidedly non-deterministic things to happen on the client.
I'd still like the ability to approve/disapprove a site that's about to play a 115meg video file as a background!
Would it be feasible to fall back to an animated gif, or even just a static image? It took so long to load that I was done reading the page, and was looking at the fine print when it started playing, and that was a little bit jarring. Moreover, the placeholder image you had already looked really good.