Can you auto take multiple pictures and then edit them in real time for an iphone app? Like say u want to make a video of a man and add a beard to him can you do it while streaming? the mustach moves according to where his face is detected and say take about 5-15 frames per second?
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I guess you can.
It would involve tracking some facial features or markers added for the purpose at the least. However this is such a vast and complex field, you’ll hardly get a single advice here that will get you going.
If you really mean it, I’d suggest looking for Augmented Reality libraries, there’s a few out there. Most of them work by tracking a special pattern and not arbitrary features though, so be prepared for a big load of work.
Check this SO question for a first few hints, you’ll find more information on the topic easily through the search engine of your choice.