Get yourself a 360 degree "bird view" camera system.
(
totally random example)
They have NTSC outputs, so you can just run an AV cable to the TV and plug it in to an AUX input (if you have a new TV without a yellow AUX VIDEO input, you can get a video to HDMI converter cheaply).
If you don't want to go to the trouble of installing four cameras, you can just put in the front one.
Bonuses of this approach:
1) You can watch all around the vehicle, not just forward.
2) These devices have SD slots and can be set to continuously record, so they serve as a dash cam.
Of course, many dash cams have some kind of video out, so you don't have to get so elaborate. But, running a wire will give you a much less kludgy setup than anything involving an app. If you don't want to even do that, get a wireless backup camera and use it backwards.