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if you want it like the youtube video you linked, it could be done quite simply, all would have to to do (in opencv) is detect the face using one the the face haarcascades like profileface_alt2_haarcascade.xml and (if you want crop the region of the face), and inside the ROI, check for smiles using the smile_haarcascade.xml.
Using this information you could easily identify on the screen if a person is smiling or not
