This project uses media pipe pose detection as a fallback of face detection. The app is hosted on github page as it is completely static. I've only tested in chrome and firefox, with climbing videos (medium range). The detection is jittery so manual editing is supported. The mask can be separately downloaded as a webp, and a pairing ffmpeg command is provided which can be run locally and much faster.
Source code at https://github.com/kmcheung12/faceblind