title: Detect a person's motion and identify his body parts moving forward towards camera on Android
body: <p>I have this requirement where I need to detect body parts or objects moving towards camera. What are some of the sample projects or library that I can look for as a starting point. </p>
  
  <p>I can take the first frame of the video as reference point and then any object that is moving forwards towards camera has to be perfectly detected. </p>
  
  <p>The camera would be managed by a person so there would be some slight shaking so the background won't be exactly same through all frames.</p>