Uh. Wow. I don't know what happened before and from the sounds of things the driver did something squirrely to catch her attention....but....You would think that LEOs would be fully aware that a certain percentage of the public is actually trying to instigate situations where they can be made to look like pure jackasses on tape (the open carry crusaders I believe like pushing confrontations with police).
Surveillance State USA. It goes both ways.
Side Note: I'm surprised that LAPD is constantly accused of having a military focus and mindset but they let something as obvious as allowing female patrol officers have hair flowing the way that this officer does. Pinned back and bobbed not for looks sake but for officer safety. If she had to go hands on then she has hair waiting to be grabbed and for her to be yanked around like a rag doll. If the guy was really violent then he could grab that hair, twist her around roll up the window and drive till all that was left was her head banging against his mirror. Totally unsafe and I wonder why they allow it.