That's basic transform animation and possibly not even with 3D layers. Really just a case of placing the pivot point/ anchor point trategically and animating a bunch of rotations or alternately scaling in one direction to similar effect combined with some colorization effects to darken the images as thy form the fold creases. The only real trick is that you would put some of the images in pre-comps and use those pre-comps instead of the original sources, so things line up perfectly when you slice and split. That said, you could of course simply buy the template advertised in the video and modify it to your needs. Sometimes a bit of hands-on learning and reverse engineering can be more telling then elaborate tutorials or longwinded explanations.
Mylenium