BlackSys CH-100B
The BlackSys CH-100B is a dashcam style camera that has motion detection and good quality video recording. It is however difficult to mount and it requires an android device, usually a tablet, in order to control the camera with their app.
Below is a motion detecting 5volt lamp on the outside of the vehicle
where the sensor will work and an example SD card camera in this case a Hikivision
which turned out to be counterfeit and did not work.

Below is there rearward look at another installation inside the
vehicle , in this case a truck camper shell prototype. The camera holding straps
have subsequently been replaced with metal plumbing tape as: 1.The metal tape
and the camera metal attachment screw 1/4' provides a heat sink radiator for the
camera which gets very hot 2.The formable metal allows aiming the camera to the
desired direction.

Below is a strap in Camera Dummy that mimics a person in a 4 way
camera system for fast installation in any human carrying vehicle.
There is a power switch in the cabin for battery issues.