[PD] how can you know if [pix_fiducialtrack] tracks a shape or not?

[Alexandros Drymonitis]

Once [pix_fiducialtrack] tracks a shape, you get a list which is the
shape's ID, x/y coordinates and rotation angle. Once a certain shape has
been tracked, how can you tell the difference between the shape being still
and not being visible by the camera? Can you obtain any data for a shape
appearing or disappearing from the camera?
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