After reading this thread I can see that it is not a very complicated process. This set up can not only work in commodores either, am I correct?
This would be quite pointless for me though as I have the Holden IQ system. Still, very impressive!
With regards to some_guy's second or third observation, couldn't you just link the system so the video stream/feed is sent onto the iPad screen and just not run a LCD screen over your mirror (massive mental blank and can't remember proper name.). Also, you could link the system like the Holden IQ system so when the reverse gear is engaged the video stream/feed is automatically displayed on the iPad.
Any mistakes or anything wong feel free to let me know.