Colin Levy, the artist of "Handscape" and the caretaker of Icarus (and maker of it's video tutorials) also has an unscripted video tutorial discussing camera mapping (a.k.a front projection mapping) in Blender with his brother Alex. Since it's unscripted, let's just call it "Camera Mapping In Blender With Colin and Alex Levy: Live!"
From his tutorial site:
Camera mapping is a really powerful technique that's used extensively in movies to turn still photos or matte paintings into very realistic 3D environments. A texture is projected FROM A CAMERA onto the objects in front of it. It allows for some basic camera moves, like push-ins and pull-outs.
It's actually a feature in most 3D applications, and so far is not available in Blender. This tutorial explains an unothodox way to get the same effect in the best free 3D application out there.
I'm sure you'll find the video worth your time to watch. Especially because you finally get to use the "make sticky" button in the mesh editing panel!