You can buy the OEM back up camera that has the image on the mirror but this won't be cheap as you need the mirror, camera, and install. When ordered on the car it was like $500, who know how much afterwords. You can also buy an aftermarket setup. I don't think you can have the image come up on the OEM navigation screen.
1978 F250 Lariat 4x2
2008 Expedition Eddie Bauer 4x2
There are quite a few out there that attach on top of the OEM rearview mirror. My coworker has a PYLE brand in his Tahoe and it is fantastic. Much larger image than the form OEM. I think he paid around $130 for it.
Here is a backup camera system from SirenNet. Its a pretty cool system for the price. It has 3 inputs. I will also automatically change from the rear camera to a left or right camera when the turn signal is activated.
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