Getting started:
- Adding OpenCV as a library http://docs.opencv.org/2.4/doc/tutorials/introduction/java_eclipse/java_eclipse.html#java-eclipse
- Setting up face detection (writes to a file) https://blog.openshift.com/day-12-opencv-face-detection-for-java-developers/
- Setting up other facial features (displays in window?) http://docs.opencv.org/master/d7/d8b/tutorial_py_face_detection.html#gsc.tab=0