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"We extract heart rate and beat lengths from videos by measuring subtle head motion caused by the Newtonian reaction to the influx of blood at each beat. Our method tracks features on the head and performs principal component analysis (PCA) to decompose their trajectories into a set of component motions. It then chooses the component that best corresponds to heartbeats based on its temporal frequency spectrum. Finally, we analyze the motion projected to this component and identify peaks of the trajectories, which correspond to heartbeats. When evaluated on 18 subjects, our approach reported heart rates nearly identical to an electrocardiogram device. Additionally we were able to capture clinically relevant information about heart rate variability."

" A python application that detects and highlights the heart-rate of an individual (using only their own webcam) in real-time. "

Short film 'Many Worlds' changes based on the audience's brainwaves and heart rate | The Verge

Plot of The Inevitable Heartbreak of Gavin Plimsole is steered by the heart rates of audience members