title: How to measure distance of an object or face from camera
body: <p>I am working on an application which actually detects the objects or faces and measures the distance from camera to that object or face. I complete the face detection area, now is there any way to measure the distance between detected face from the point where camera is located.</p>
  
  <p>Please Provide any link or source code I have searched a lot but all in vain.</p>