Camera as antitheft system for cars
Use state of the art facial recognition system to register users of a car. - This can be done with a resonably priced camera, and in-car-CPU. The car would not start unless a registered user operates the car.
In security parlence, this can be a strong biometrics (second factor authentication) for the car. This can in additional to the key that we may be currently using.
System can be built for registration, addition, deletion, title transfer etc. If the car is supected to be stolen - we can set parameters for them, a variety alerts can be send to authorities.