title: using FindExtrinsicCameraParams2 in OpenCV
body: <p>I have 4 coplanar points in object coordinates and the correspoinding image points (on image plane). I want to compute the relative translation and rotation of the object plane with respect to the camera. </p>
  
  <p>FindExtrinsicCameraParams2 is supposed to be the solution. But I'm having troubles with using it. Errors keep on showing when compiling</p>
  
  <p>Has anyone successfully used this function in OpenCV?? Could I have some comments or sample code to use this function?? </p>
  
  <p>Thank you!</p>