title: Estimating distance from camera to ground plane point
body: <p>How can I calculate distance from camera to a point on a ground plane from an image?
  <a href="https://i.stack.imgur.com/Jwqoj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Jwqoj.png" alt="enter image description here"></a></p>
  
  <p>I have the intrinsic parameters of the camera and the position (height, pitch).
  Is there any OpenCV function that can estimate that distance?</p>