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.
Trying latest 64 and 32bit releases from github, they both fail due to missing libintl-8.dll libwinpthread-1.dll libgcc_s_dw2-1.dll
Not sure where to find these, or why they don't ship with ZBar, but seems it no longer works as is.