Yes they do
They only work on long URL's without the extra uh, youtube command extensions (&hd=1 for example)
[URL]http://www.youtube.com/watch?feature=endscreen&v=rrcYnqPQg6M&NR=1[/URL]
Only thing you need is the rrcYnqPQg6M part
[URL]http://www.youtube.com/watch?v=rrcYnqPQg6M[/URL]
And there you go, that URL works with [video]
Or even more easier, just go to the video and press [B]Share[/B] then you can select [B]Long link[/B] and then you just copy the copy the code URL above