rm -rf OpenCVPlugin/src/OpenCVPlugin/build
mkdir OpenCVPlugin/src/OpenCVPlugin/build
cd OpenCVPlugin/src/OpenCVPlugin/build
cmake ..
make -j4
chmod 640  ../../..//lib/plugins/libmxpi_OpenCVPlugin.so
cp ../../../lib/plugins/libmxpi_OpenCVPlugin.so ${MX_SDK_HOME}/lib/plugins