Help with 3D camera, can't work out this effect

[abih16433932]

Hello, i'm really stuggling trying to re create this effect (see link) of the polaroids spinning around the girl. I've tried to recreate this effect and i can get the polaroids to spin in a way that makes it look 3D. I know i need to use the 3D camera, however i dont undertand how its been masked to make the polaroids look like they're going behind and in front of the girl. Absolutely ANY help would be appreciated, or a detailed explanation or any useful youtube tutorials, just can't seem to get my head round how this works. Thank you!

These are two very similar videos or the same effect:

Video 1

Video 2

[Towerguy]

Hi, put another layer of your person on top of your polaroids and mask out the part of them that stays in front when something goes behind - that's the basic principle.

[Mylenium]

You simply will need multiple layers and duplicates. It's all just illusion painting in 2D. At best you create pre-comps of your swirling cards and you then simply arrange them in the parent comp as needed with additional masking and using the keyed person as a track matte. again, you just need to spend more effort on it. This is nothing you can do with a single comp and just a few 3D layers in the same comp. It requires  to use duplicated layers over and over.

Mylenium