I have watched the video several times and I do not see the guy doing anything wrong. Yes, he accelerated into the left, then right lane, but once the pick up truck went to the right turn lane, switching over was a normal thing to do.
Next, you really have to look at the Altima. It has it's turn signal on and the rider appears to be trying NOT to be in the Altima's blind side. the Altima, in my opinion was being wishy washy - hesitant - maybe because he didn't know what the bike was going to do and the bike wasn't sure what the Altima was going to do.
The Altima started to change lanes and the bike braked.
The Police Officer was wrong ! Period ! Too close, not watching the traffic ahead. Probably running the bike's plate on his computer.
The cop knew if a supervisor was called he was in a world of hurt. The Agencies I have worked with, if you didn't report even minor incidents like that, you were in trouble.
As for the video cam, I know a lot of guys wearing them now to protect themselves from being blamed or helping show who was at fault in an accident. I plan on getting one sometime.