rear view camera

Might be a stupid question. Can a person fit a rear view camera to the nav unit and have it display while riding?

I always wanted to try this idea out and finally did after finding a kit w/ a 5" 12v LCD that would fit on the front of the GPS prep cover plate. It connects to an HD wide angle rear view camera. I only use Nav V when traveling out of my area so for the vast majority of my local riding it...