IME Iterative Motion Estimator - how to get access to raw data?

Hi guys,
looking at the “iterative_motion_estimator” sample I was wondering if it’s possible to get access to the “raw” data of the motion field. I saw that the motion field (vx_image) is sent to a render and the render does the job to draw it on the image but I’d like to get something useful to do calculations on it (such as a vector of points).

Any one can help me?

Thank you in advance.