This is how I spent my weekend hooking up my car stereo w/ rear view camera. Paid about $150 for the whole set up. Good if youre on budget. Here’s some pics of it in action, more info  and as you can see youtube video demo.

I was recently given a 93 Buick Park Ave with 60,000 miles in pristine shape. I took out the stock radio and put in this XOvision xo1930 (walmart) head unit paired with a Hootoo Backup Cam (amazon). In this video I basically tested out all the functions from DVD, DVD files, USB stick, aux input and backup cam. Maybe this will help people who intend to get a set up like this going on a budget.
The camera is powered off the reverse lights I bought some 16g wire and connected the wire from the head unit to the reverse light in trunk as well so when i pot the car in reverse the cam pops up on the screen. I can play DVD’s while in drive or any gear for that matter and that can be done by connecting the wire to I believe it was the headlight lamp or the car power I forget which. I was also able to run the wires through a small crevice in the backseat and ran the wires the rest of the way under the plastic trim, camera seems to be working great and kicks right in when thrown into reverse. Pretty cool feature for less than 20 bucks and an hour of work on a Friday afternoon.

Media that was played was
EC Allstars DVD video shown was EC All Stars
A Tribe Called Quest (off data dvd)
Action Bronson – Nightcourt (off ceative zen media player Bon Apetit Bitch!)
Necro (USB stick)