This can be done with a series of photographs with the people masked out. You apply color effects or color overlays to the images, arrange them in 3D space, and then animate a camera move through the maze of photographs. The color effects could be achieved using different blend modes and a color gradient over each photo combined with levels and saturation effects to give the photos that old faded photo look. It would probably be easier to do the color effects in Photoshop first. The flash between frames could be accomplished with a solid colored layer with the blend mode set to add and animated opacity.
To figure something like this out try and look at one element at a time. Try a few things to achieve that effect on a single layer. When you have the look you like, start animating.
If all of that was Greek and you're thoroughly confused search AE help for Animating Cameras, Blend Modes, Masking, Working in 3D space, and color balance.
These suggestions should get you started.