In the video above, MIT graduate student Ming-Zher Poh discusses a system he designed that holds the potential to measure vital signs just by having a person stand in front of an inexpensive camera such as a laptop's built-in webcam.
The system produces pulse rates that agree to within roughly three beats per minute with the rates obtained from an approved monitoring device. It was also able to obtain valid results even when the subject was slightly moving in front of the camera. Poh is working on developing the capability to obtain blood pressure and blood-oxygen measurements from the same video feed. If he's successful, you might one day take vital sign readings while brushing your teeth.