QR codes are interactive physical links that can be photographed and scanned. Anyone can scan a QR code with a compatible phone camera, and visit the QR code link in their mobile browser. The majority of default smartphone cameras are compatible, some phones may require a QR code scanner app.
You can share your Dubb QR code, and this allows you to transfer your video links to physical media, or anything someone can scan with their phone.
Here's a video to explain how it works:
Copy your video page QR code from the shortcut here:
It's also in the Share and Send options in a dedicated section: