Also I have a fair number of cars in for service/repairs that have the front/rear tiny vid cameras that mount on the screens, I assume they are for possible insurance claims etc and switch themselves on when you start the car, such as the Prestigio Roadrunner In Car Video Recorder (no thrashing on a road test then)
The quality seems pretty good on some of them (as shown on YouTube) but I don't know how good the stills would be ? but are cheap enough.