Considering almost every vehicle in the lot was a cop car and all the people in the lot were cops I concluded that it was in a police station parking lot. These lots are usually behind fences and gates to keep the general public out. And since the video was a dash cam of decent quality I concluded it was a cop car that was bought using tax payer money since that gets spent like no tomorrow. They didn't proceed to pull the driver out and arrest them so it must have been a fellow cop.