I was at the dealership this morning and while I was waiting I had a chance to check a 2005 Murano with a backup camera. It looks like the camera retrofit to a o3 or 04 may not be as easy.
To accomodate the camera the outside tailgate or hatch handle has been changed and not only it is smaller, but it is also electrical. In other words, there no handle to pull on. It is now a button that you push to unlatch the door.
One thing I could not easily see was whether or not the gate itself was the same. If it is, then the retrofit would involve replacing the hatch locking mechanism, otherwise the whole hatch needs to be replaced as well.