The idea was to seek spots in the city where public web cams are pointed at, and paint QR codes on the ground at those spots (using a template), linking to the camera stream. So when curious passerbys scan the code, they see themselves in a camera stream and feel "watched".
I'm only aware of boring rooftop weather webcams where obv you can't see yourself.
Any examples for what you speak of?
Quality isn't great, but you could likely see yourself recognizably.