For those that might be interested:
Modified NetTalk File Upload example application demonstrating the use of Javascript to capture upload events.
Also shows how OpenCV.js can be used to perform client side image modifications.
https://drive.google.com/file/d/1uEPSLrt5I1Vq6_LaxND8B-KorE3ACcBU/view?usp=sharing
https://docs.opencv.org/3.4/d5/d10/tutorial_js_root.html
