Real-time Human Pose Estimation in the Browser with TensorFlow.js

So what is pose estimation anyway? Pose estimation refers to computer vision techniques that detect human figures in images and video, so that one could determine, for example, where someone's elbow shows up in an image. To be clear, this technology is not recognizing who is in an image -- there is no personal identifiable information associated to pose detection. The algorithm is simply estimating where key body joints are. Ok, and why is this exciting to begin with?