ZBar is an open source software suite for reading bar codes from various sources, including webcams. As its development stopped in 2012, I took the task of keeping it updated with the V4L2 API. This is the main repository for it. There's a clone at at LinuxTV.org, and another one at gitlab. https://linuxtv.org/downloads/zbar/
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/mchehab/ZBar/