I think that video is going to help a lot in determining what happened. My thoughts are that he was entering slow flight (because that what it looks like to me), and it looks as if there was a lot of yaw that went unnoticed or uncontrolled, or just flat out couldn't be compensated for, and yeah, we know what happened from there, haha. Anyhow, that's what the video looks like to me, I'm not going to say it was mechanical failure, and I'm not going to say it was pilot error, all I'm saying is what I saw from the video.
If you take a look at the link that I posted, it is possible to see an interesting thing. It would appear that engine number 2 (RH), the nozzle is closed compared to engine number 1 which is open. This would indicate the engine is in idle. I though it could be down to the angle of the picture, but the nozzle does look a little more pointed (closed) than the other :-?
Matt
"A bit of a pickle" - British translation: A catastrophically bad situation with potentially fatal consequences.
PETA

People Eating Tasty Animals.
B1 (Cat C) licenced engineer, Boeing 737NG 600/700/800/900 Airbus A318/19/20/21 and Dash8 Q-400
1. Captain, if the problem is not entered into the technical logbook.........then the aircraft does not have a problem.
2. And, if you have time to write the fault on a napkin and attach to it to the yoke.........you have time to write it in the tech log....see point 1.