I am not a great analyzer of swings as I have been taking lessons myself, but your club face is definitely opening up a lot on the back swing and your right elbow is pulling way to far inside behind your back. I am sure the experts will make some more intelligent comments for you.
See this though.
http://thesandtrap.com/t/54238/elbow-position-and-its-effects-on-the-downswing
Sorry for the bad photo, had to take it with my cell phone of your video, but check out your right elbow here:
