Hi ernestpauld,

Capture the Qr Code Image using Web Camera and save it. Then use the saved image to read the data.

For capturing image using Web Camera refer below article.

Capture Image (Photo) from Web Camera (Webcam) in ASP.Net using C# and VB.Net

For reading QR Code image refer below article.

Read QR Code Image in ASP.Net using C# and VB.Net

Use setInterval to continuously capture the image.

For more details refer below article.

Change Background Image of HTML DIV every 5 seconds using jQuery