navigator.getUserMedia is now deprecated and is replaced by navigator.mediaDevices.getUserMedia. To fix this bug replace all versions of ``withnavigator.mediaDevices.getUserMedia
The video eventListener for play fires up too early on low-end machines, before the video is fully loaded, which causes errors to pop up from the Face API and terminates the script (tested on Debian [Firefox] and Windows [Chrome, Firefox]). Replaced by playing event, which fires up when the media has enough data to start playing.