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I was wondering how the characters in this app are animated on screen. Is it possible to have a video with transparent background to put as the overlay of camera capture ? Is this just a set of UIImages animated together ? These characters seems more animated than simple gifs.
That is most likely an OpenGL animation you are seeing overlaid on the camera display. See one of the often cited answers of Brad Larson on how to do that – includes a linked example project (that dude rocks).
To achieve that effect, you use the input of the camera, put that on a planar object as a texture and render your stuff (highly animated characters or even naked, dancing robot women) on top of it, presto.