If you have a newer headunit (.9something software version) or Series 2 headunit (if you got the aussie one). Then all you'll need is a connector for the head unit and you'll have to run the camera data wire from the trunk all the way to the head unit. The power for the camera I think you can tap into reverse lights.
Also, you said you have VIM I assume its unlocked for speed right? If not you might need to do that. Thats what I can think of the top of my head there maybe more.