No functions for face recognition and more - big lacks!

[ghost]

premise: you have done an amazing job, yet I have noticed the library is missing many fundamental functions: load() train() update() write() predict() etc.. https://docs.opencv.org/4.x/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#ac8680c2aa9649ad3f55e27761165c0d6

Without such functions, it's impossible to develop a scalar custom model able to recognize faces. Essentially so far the library is just able to detect objects.

I'm really looking forward to using your library as soon as you have added those features!!

[youthlin]

@ghost it seems that, those functions are in the contrib sub package: https://github.com/hybridgroup/gocv/tree/release/contrib