Couldn't reporting a school absence be done in an instant with a QR code?

There was a scene where the child of a YouTuber I love caught a cold and they were panicking, saying, "I have to report the ...

I created a Windows app called 'QR Code Image Reader' that can read multiple QR codes from images at once

IntroductionPreviously, I created and introduced an app that reads QR codes using a PC webcam. As it turns out, there are surprisingly many situations where you want to read QR codes on your PC screen ...
Hackaday

QR codes

Adding a camera to a project used to be a chore, but modern camera modules make it simple. But what if you want to read QR codes? [James Bowman] noticed a $7 module that claims to read QR codes so he ...