IT’s a Card Wipe tutorial done up by Total Training. Not too sure if you can still get it online. Essentially, you’ll need to create a grid of people. You can create the grid in Photoshop or in AE (using Particle Playground’s GRID option) with a single person (still or movie will do just fine) as a Layer Map.
Then apply card dance and ensure that the number of cards setting is identical to that for the grid. Then animate either the x or y-zxis. You may want to add some jitter to add realism.
I suggest that you start with a small number of people – 4 – 8 and finetune the technique before embarking on a full-blown exercise.
Cheers
Roland Kahlenberg
broadcastGEMs
customizable animated backdrops with Adobe After Effects project files