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Yes. Just use the VideoCapture class. The first device is normally the webcam. Docs here: http://docs.opencv.org/2.4/modules/highgui/doc/reading_and_writing_images_and_video.html#videocapture
In the samples you can find some code that does face recognition in real time: http://docs.opencv.org/2.4/modules/contrib/doc/facerec/tutorial/facerec_video_recognition.html?highlight=face
