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Basically QR codes are a representation in binary images that should be read as bits. There is no included decomposition algorithm in OpenCV included, but if you know how the bits relate to the algorithm, I guess implementing in C++ wouldn't be that hard.

This link is an example of such a code, you can integrate this with your OpenCV project easily.

http://eigen.tuxfamily.org/dox-devel/group__QR__Module.html