Constrain a moving camera to a plane

I'm trying to create a camera that will move with player input, but stay focused on a plane placed flat on a wall. I want the camera to be on the "see through" side of the plane, but clip to the plane's edges exactly even if the camera moves toward, away from, or side-to-side of the plane. Additionally, I'd like to be able to render the camera's view to the "opaque" side of the plane. Any ideas? Please help!