Im new to the car pc thing, but in no way knew to computers...

Ive been researching things, and have found a screen i think i like...
But this monitor doesn't do auto switching for rca (eg if i want to use a rear view camera when i reverse)

my question is, Can this be done in software somehow? or must it be done in hardware?
If it can be done, by connecting the rear view camera to some hardware then that to the pc, what hardware is needed for this?

Since the monitor itself wont do this, can I do it with additional hardware, I would like to be able to say just have a window with the camera in it, while having the nav up or other things?

Hopefully I am somewhat clear in what i am looking for.

Thanks for your replies!