How to make a 3D object from a 2D drawing/picture?

I saw at http://www.youtube.com/harrypotter “3D experience”.
You just print out the cauldron 2D drawing and when your camera recognizes it, it shows 3D cauldron.
That totally impressed me!

I was looking on internet for some informations.. but nothing.
So, can someone please help me? Link me some source of informations or something like that?

Thanks. -Truba.

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