Pinch Gesture With a Canvas

Hello all!

I haven't touched the new touch input with 4.6, and I need to be able to zoom out with a pinch and move the canvas around a set area. As an example, I have a background image of 4 images that are 4096x4096 that make a large square. I need the canvas to be able to move around that image and be able to zoom in and out of it. I have no idea on how to even begin doing this though. If anyone has an idea on how to accomplish this, that would be great!

Currently it's an Overlay Canvas, no camera's involved.

Thanks!