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You need to compile OpenCV from the sources with some flags such as TBB for best multithreading performances. Moreover you can set many flags, I sugget you to use CMake GUI and check it. If the time execution matters, I suggest you to compile in RELEASE mode and not in debug mode: doing so the resulting binary will be more compact and the execution time is just impressive comparing to the DEBUG mode. Activating CUDA is also a good choice. If you don't need debug, then I suggest to you this:
cmake -D WITH_TBB=ON -D WITH_OPENMP=ON -D WITH_IPP=ON -D CMAKE_BUILD_TYPE=RELEASE -D BUILD_EXAMPLES=OFF -D WITH_NVCUVID=ON -D WITH_CUDA=ON -D BUILD_DOCS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=OFF -D WITH_CSTRIPES=ON -D WITH_OPENCL=ON CMAKE_INSTALL_PREFIX=/usr/local/ ..
If you need debug or just want an idea, go here
P.S. = similar question that have the same link I gave here is this one
