1. A method, comprising: generating a first list of new smiling faces for a first frame of a plurality of frames based on performing smiling face detection employing an object classifier that is trained to distinguish between smiling faces and objects in the first frame that are not smiling faces; employing the first list of new smiling faces from the first frame as a first input smiling face list for a second frame of the plurality of frames; generating a list of tracked smiles for the second frame, comprising tracking smiling faces in the second frame from the first input smiling face list for the second frame; generating a second list of new smiling faces for the second frame based on employing the object classifier, the object classifier trained to distinguish between smiling faces and objects in the second frame that are not smiling faces; and generating a combined list of smiling faces as a second input smiling face list for a third frame of the plurality of frames based on combining the second list of new smiling faces for the second frame with the list of tracked smiles for the second frame.