Read original post at Benjamin Soulier's Blog
I have been looking around the web for reading a QR Code from the camera of their Windows 8 device. No luck I found nothing that was looking in that direction.
So I just take the ZXing barcode scanning library from Codeplex, modified it a bit, but the biggest part was around getting the output of the webcam as stream to get frames from it and send it over to this barcode library.