Some very good Tutorials I found about Camera Mapping and Projection while learning. 

Example of Camera Mapping by Bernd Montag

Tutorials by Nick Campbell aka Greyscalegorilla Part1:

Part 2:

A really nice breakdown video and tutorial from Mustapha Fersaoui

Feel free to add and share your favorite tutorials in the comments.

Resources:

• http://greyscalegorilla.com/blog/tutorials/camera-projection-and-gi-in-cinema-4d-part-2-compositing-the-scene-in-after-effects/
• http://www.mustaphafersaoui.fr/freeze-time-c4d-camera-mapping-breakdown/
• http://www.mustaphafersaoui.fr/tutorial-02-camera-mapping/