It is possible, or has anyone attempted to install a reverse camera and hook it up to the navi screen

 

Good lord, man! It's probably the third most commonly-discussed topic here.

Go to the "Search this Forum" button in the upper right corner of the topics list and enter "backup camera" in the search field. You'll find more threads than you'll ever care to read.

 

yes... look at the audio FAQ at the top of the list of threads here...