I would be willing to bet the footage onboard any one of the myriad of cars with adaptive cruise control or backup camera is actually property of the car company and not the owner. Who is to say that the LAPD or any other police force has an agreement with Telsa, Ford, GM, Toyota ......
I for one hail our new surveillance state overlords :-) and am glad I drive a 20 year old mini truck with no AC and hand crank windows.