zoom into a face or other item found via a cascade classifier- demo using opencv with haar cascade. uses first cam on system.
https://docs.opencv.org/master/d7/d8b/tutorial_py_face_detection.html
example at command line: python facezoom.py haarcascades\haarcascade_frontalface_alt.xml
press q to quit press s to save the current image in current dir.
the haarcascade may be changed out---the provided is from the openCV repos@ https://github.com/opencv/opencv/tree/master/data another cascade source @ http://alereimondo.no-ip.org/OpenCV/34