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.
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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.
