When
            you position the reference box, the tracker box automatically moves to
            the same location so that when you start analyzing, both boxes are
            positioned over the reference point.
         
         To position the reference box:
         
         
            - Go to the frame where you want to position
               the reference box.
            
- If the tracker you want to position does
               not appear on the image, click the appropriate Tracker in the File
               Browser, and enable Active.
               
            
- Position the cursor to the center of
               the reference box until it changes from a cross to a multi-arrow
               shape.
            
- Click and hold the reference box and
               drag it over the pattern you want to track (in the example below,
               the rider's head). The reference box is magnified to make it easier
               to select a position. By default, the tracker box stays with the
               reference box.