From the iTunes description:
Vital Signs Camera is the only App that measures your heart rate and breathing rate remotely, simply using the camera of your iPad 2!
It was $0.99 and I was bored at Starbucks so I purchased the app. Amazingly, it works. The heart rate seems pretty accurate and it was pretty fast to acquire it too.
Overall I find the app pretty useless, but amazing at the same time.