Video In for rear view camera/dvr

[GiGo]

I was hoping to add rear view camera to my Joying, I have a camera which connects SPDIF, which I assume plugs into the Video In port in the back of the head unit, what app can I use to view the camera feed?

I was also thinking of using the camera to record the rear view of the car also, can anyone recommend an app to be able to do this?

I habe tested out the camera using AUX-IN app but it just hangs and crashes.

TIA