title: Extract the selected zone on a picture with opencv python
body: <p>I'm using OPENCV to detect a face in a picture and I want ot extract it, so i have the photo with a man and the expected result is a jpg image with only the seleted face </p>
  
  <p><a href="https://i.stack.imgur.com/AWWNy.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AWWNy.png" alt="enter image description here"></a></p>
  
  <p>I have detect the face but if someone can help me to extract this face and save it! </p>
  
  <p>Thank you all</p>