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Just looking at the kivy-garden zbarcam repository readme there is no mention of iOS (but Android is mentioned), and there is this open pull request for iOS support. It's not clear if that's the reason for the build failure of opencv though..
Yeah according to this issue there is no recipe to cross-compile OpenCV to iOS. So to use zbarcam you probably would need to rectify that, plus the zbarcam recipe itself.
The best place to look for example code is probably in the plyer repository iOS code, see https://github.com/kivy/plyer/tree/master/plyer/platforms/ios