You can skip to 3 mins in... I have questions about the true nature of the encounter after watching the video. In it you see a marked police car behind him, at one point before he is stopped he looks back. If he was being chased before the stop, it would put things in a different light.
That being said, it does not change the fact he shouldn't have been punished for recording the stop, and the police treatment of him following the stop itself is inexcusable.