Google is soon adding some interesting new features to its Fit app for its Pixel smartphones. You'll be able to measure your heart rate by placing a finger on the rear camera, which reminds us of a fad from many years ago in the Android world. This works by tracking color change as blood moves through your fingertip. On the other hand, measuring your respiratory rate works with the selfie camera, where you position yourself within a frame and then just breathe. The software will monitor the rise and fall of your chest and infer the rate from there. A Google Health product manager...
Source: https://www.gsmarena.com/googles_pixels_will_read_your_heart_rate_and_respiratory_rate_with_their_cameras-news-47590.php