How to drag and drop an picture over another picture?

I am building now a ios app in object-c in Xcode. It is possible now to select a picture from the library or make a picture. The picture is showed full screen in the app. I would like to select another transparant picture and drag it over the existing picture. Transparant pictures like: a clown nose, hat, cap, earrings, mustache, glasses etc.

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have you figured this out? I cant find any sample out there.