I don't see anything wrong with what the guy did in the video. He was quickly replying to the cops request of "Can I see your ID, please" as he was getting out of the cruiser. Further, if I was the one getting shot, I'd be wailing like a Ferrengi. This dude was able to not only keep his hands up, but then continue to follow instructions.
The cop shoulda waited to give instructions until a time that he is ready for those instructions to be carried out.
Seat belt stops are lame, too. I don't mind if they add it to a more serious offence, but stopping people for that alone is chicken shit fishing IMO.