sh-3.2# find . -type f -name "haarcascade_frontalface_default.xml" -print
sh-3.2# cd /usr/
sh-3.2# find . -type f -name "haarcascade_frontalface_default.xml" -print
./local/Cellar/opencv/2.4.13/share/OpenCV/haarcascades/haarcascade_frontalface_default.xml
./local/Cellar/opencv3/3.1.0_3/share/OpenCV/haarcascades/haarcascade_frontalface_default.xml
sh-3.2#