Covid-19 – webcam app to detect and discourage own face touching

This app does not exist, but if anyone here could build it, I am sure it would be popular. Learning to not touch your face is one of the best things you can do to prevent transmission of viruses like flu and covid. surely it makes sense for businesses to use this. It just has to beep or flash when you touch your face so you learn not to do it.

Just want to put the idea out there as I am not able to build this myself