Image via CrunchBaseSince a couple of days youtube supports embedded high quality videos. Therefore youtube added a option to switch to 'HQ' mode via the video player.
Until that release of the video player you had to do a little hack to get hq videos embedded into your site.
You can find the (meanwhile obsolet) hack easily by asking Mr. Google about it.
just to give you an idea - one of the best TV-Series i've seen