Front camera modification?

Just thinking out loud here...please bear with me. So today I had to hook my Frontier to my coach tow bars to test fit a stone guard I built. When by myself it is always a pain in the butt to get the truck close enough to hook up, but not inside the radius of the tow bar. It sometimes requires me to move the truck a few times. Thinking about the problem, I thought about those wired/wireless backup cameras that you see for sale everywhere. I'm wondering about installing one in the front grill of the Frontier, so I can see the tow bar without getting out. Now here is the question: Does anyone know of a way to connect a backup camera to the Nissan video screen system so I could just look at the video output on the truck and see the front camera? I would guess an A/B switch would be necessary and maybe some kind of harness adapter? Any help from you folks who play around on the video/audio side would be most appreciated!