Read QR codes with the QR Reader DAT. Simply feed the DAT a source TOP to detect QR Codes from. This DAT is built in OpenCV 4.1 and is slow at high resolutions. It's recommended to bring your image down to a suitable size before processing in the DAT. At 300x168 the DAT cooks at around 8ms on a decent CPU but at 1920x1080 it cooks much much slower at around 40ms. 300 pixels wide at the ratio you wish to use is a good balance between accuracy and speed.
The download comes with the QRReaderDAT.dll file and the opencv_world410.dll file which the QR Reader DAT depends upon. Ensure that both are in the same folder in your Derivative plugins folder.
Warning: The following operator only works on windows TouchDesigner 099 official 64 bit build 14650 or above. Mac OS and 32 bit TouchDesigner versions are not supported.