The AIM MX2E dash offers an input for a reversing cameras.
The dash can be programmed to switch views do the camera using an external trigger, or one of the push buttons.

To be able to get the camera signal from the rear end of the car to the dash, you either need to run a wire (with a 5-pin Binder connector) of you could do this using a wireless connection.

This wireless transmitter / receiver will allow you to run a camera without the need of pulling a wire through the car.

All you need to do is provide power to the transmitter at the rear of the car, plug the receiver in the MX2E dash and you're good to go.