What I am trying to do is create a line (spline track) and point it from a windsurfer to a text saying "Windsurfing". I want the line to stay connected to the text in one end and to the windsurfer in the other end.
The text stays in position and the windsurfer moves.
I have tracked the windsurfer and want to apply the tracking data to the one end of the line only. So that the other end is anchored on the text.
One way to do this would be to use the Corner Pin Tracker, setting it up so that two of the points are locked to the text and two of the points are on the surfer. The pinned element is the line between the surfer and the text.