You can use the factory camera if you know how to make a harness direct from camera to lock pick, I have the proto camera in my truck, here's how the after market system is working.
Put truck in reverce camera comes on, while driving press and hold phone button on steering wheel for 3 sec, a promp shows on nav screen, veiw rear camera Y OR N , press phone button again promp veiw front camera Y OR N, once you press and hold the phone button, you scroll through the lock pick functions, rear camera , front camera, dvd, and so on.
Put truck in reverce camera comes on, while driving press and hold phone button on steering wheel for 3 sec, a promp shows on nav screen, veiw rear camera Y OR N , press phone button again promp veiw front camera Y OR N, once you press and hold the phone button, you scroll through the lock pick functions, rear camera , front camera, dvd, and so on.