code: func loadCascadeClassifier(haar string) *gocv.CascadeClassifier {
  	if classifier != nil {
  		return classifier
  	}
  
  	c := gocv.NewCascadeClassifier()
  	c.Load(haar)
  	classifier = &c
  	return classifier
  }
docs: // loadHaarClassifierCascade returns open cv HaarCascade loaded