How are you arriving at that page you are linking to – are you clicking through form another forum or searching on youtube.
If you search for that video on youtube you get a much shorted URL – maybe its the
https://www.youtube.com/watch?v=-aN8H2U0RKY rather than
https://www.youtube.com/watch?feature=player_detailpage&v=-aN8H2U0RKY
lets see if the shorter one works..
[video]https://www.youtube.com/watch?v=-aN8H2U0RKY[/video]
Edit… that’ll be a no then. in that case it looks like the people who posted the video up on youtube have disabled embedding
This one works fine – see
[video]http://www.youtube.com/watch?feature=player_embedded&v=k9wt5TrI7II[/video]