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Do you mean use the Qt enhanced high gui window or use opencv in your Qt app?
If you are programming with Qt - simply add the openCV include and lib dirs, include the opencv library files as with any other and make sure the opencv dll's are in the path.
The opencv image format is directly compatible with QImage's BGR.
If you want openCV to use the Qt version of highgui and none of the downloads are suitable then you need to build opencv from source. This depends on your OS but there are walkthroughs on the docs.opencv.org site
