title: Object tracking in OpenCV
body: <p>I had been using LK algorithm in detecting corners and interested point for tracking. 
  However, I am stucked at this point where I need to have something like a rectangle box to follow the tracked object. All I have now was just a lot of points showing my moving objects. </p>
  
  <p>Is there any methods or suggestions for that? Also, any idea on adding counter into the window so that my object moving in and out the screen can be counted as well?</p>
  
  <p>Thank you</p>