Sure, no trick at all. The easiest solution is to install a Gentex rearview mirror, which electronically switches from being a regular mirror to being an LCD monitor when you shift into reverse:


Color Back-Up Camera / Universal Monitor :: Sigma Automotive


You can mount it to the windshield, or there is someone here who figured out how to attach them to a Mercedes stalk.

There are any number of suitable rearview cameras, including a bunch of cheapo Chinese cameras on Ebay that can be painlessly swapped when they dim (they eventually always do). Electrical connection is simple: you need a switched 12V+, a ground, 12V+ from the backup switch and a thin coax connection to the camera.