GitLab

Require hardware:
- genericx86-64 bsp;
- usb webcam;

Require softwre:
- OpenCV
- TensrFlow/TensorFlow Lite
- The usb webcam kernel driver

Provide function:
- collect_face: start camera to collect and label human
  face images for retraining.

- recognize_face: start camera and inference through tensorflow lite
  model to recognize human face
  The opencv code refers:
  https://docs.opencv.org/3.4.5/d7/d8b/tutorial_py_face_detection.html



- Save avi video from usb webcam
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>