-lopencv_core -lopencv_videoio -lopencv_highgui -lopencv_imgproc -lopencv_objdetect
g++ face.cpp -I/usr/include/jsoncpp -lopencv_videoio -lopencv_core -lopencv_highgui -lopencv_objdetect -lopencv_imgproc -lopencv_imgcodecs -lcurl -ljsoncpp -lcrypto