I recall the "zbar" library being (relatively) easy to integrate and working damn well out of the box, on both iOS and Android, back in 2011 or 2012. I'd expect it's gotten even easier, if anything. It's been a while but IIRC you just find a way to hand it bitmaps from your camera, and it does the rest, spotting and decoding QR and bar codes.
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I recall the "zbar" library being (relatively) easy to integrate and working damn well out of the box, on both iOS and Android, back in 2011 or 2012. I'd expect it's gotten even easier, if anything. It's been a while but IIRC you just find a way to hand it bitmaps from your camera, and it does the rest, spotting and decoding QR and bar codes.