Training own classifiers using trainCascadeObjectDetector for face detection
If you want to train the classifiers with your own database, you will only need 'trainCascadeObjectDetector' function and feed your images into the proper arguments (Positive, negative images). The output classifier will be in your 'outputXMLFilename' as in  traincascadeobjectdetector

trainingImageLabeler is helpful function for classifying positive/negative image. Try this function later when you work with larger database.