I'll added a front facing parking camera specifically to see approaching curbs before they hit my lip / bumper. It wasn't hard to integrate with my backup camera, and works great with a manual toggle switch that i hid in the console.
All you really need for front/side views area front facing camera(s), and a multi camera input box like the one here. Usually side views are activated via wiring to signal stalk, and manual toggle button.
[ame="http://www.amazon.com/COOLINT-Multiple-Cameras-Control-Parking/dp/B00U4Y1AW4"]Amazon.com : COOLINT CH-4S Car Multiple Cameras Image Switch Control Box for Front/Rear/Left/Right View Parking Camera System Video Control 2/4 Cameras : Car Electronics[/ame]
