Id really like a SIMPLE DIY for installing other AUX imputs to the NAV screen, but all of the threads on it are REALLY old (last one I looked at was from 2005)

Are there any more modern DIY's for easy Add aux options to the factory NAV using some more modern electronic devices available? Like say a plug and play?

I would like to be able to add a Backup camera, a laptop input and maybe a dvd drive.