g++ -std=c++11 -I/usr/local/include/opencv -I/usr/local/include/opencv2 -L/usr/local/lib/ -g example.cpp -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_stitching -lopencv_imgcodecs -lopencv_videoio -lopencv_flann -lopencv_photo -lopencv_shape -lopencv_superres -lopencv_videostab