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Hi Zadacka
As far as I know the folder opencv contains the header files for old fashion C style opencv functions and the folder opencv2 contains the headers for the new and more flexible C++ interface (please someone correct me if this is not accurate).
This is just my opinion, but I would not consider a good practice to drag and drop include files into your project unless for very specific reasons. Have you considered using CMake to automatically generate your project? This tutorials might help you.
Best regards
