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First step : face detection --> only works with frontal faces

http://docs.opencv.org/doc/tutorials/objdetect/cascade_classifier/cascade_classifier.html#cascade-classifier

Second step : face recognition --> can be done in many ways, but eigenfaces / fisherfaces is used a lot in practice, when trying to perform this

http://docs.opencv.org/modules/contrib/doc/facerec/facerec_api.html?highlight=eigenface#Ptr%3CFaceRecognizer%3E%20createEigenFaceRecognizer%28int%20num_components%20,%20double%20threshold%29