I missed what was discussed here about this video on another thread. But from what I saw on the video, I don't think the cop is following appropriate procedures: he's using an unmarked car without lights, suddenly blocks the motorcyclist and opens the door of the car pointing a gun at the motorcyclist, even if it was not for too long. I think he should have identified himself as a police (for example, famous batch in one hand and gun in the other).
Indeed, the guy in the motorcycle was videotaping his own actions on a public road (which could have been used against him because he was speeding a popping wheelies). Of course, I'm not a lawyer, this is just my opinion.
Police patrols have video cameras with audio, they do not tell people that they are been videotaped. The video/audio could be used as evidence, training, even to be shown on TV programs. A videocamera in a helmet is obvious and this cop never asked if the video was on (at least on the portion that is shown).
As "motogiro" said, if the cop would have not done anything wrong and would have asked not to post the video, I don't think there is any problem, but I don't think the police follow appropriate procedures and once the video was posted, then the guy was charged!!!!!!
Here's a vid of a DIY camera into a car. The guy who made it had a previous encounter with a cop that he thought was unfair, so he decided that he would have proof on his side next time. This was reported on KMOV out of St. Louis, but the link on their site is dead.
Watch Cop Lies And Threatens Kid For Nothing Video | Break.com
This is so sad, and indeed, on the second half of the video, the police agent changed his interaction.
Unfortunately authority and power get to a lot of people, and even change them for worse...