Tracking markers or fiducials

Questions
1

Finding online examples of the use of Mathematica for fiducial or marker tracking has been difficult. Your feedback regarding such examples would be much appreciated.

Thanks,

Marc

2

http://www.wolfram.com/mathematica/new-in-8/comprehensive-image-processing-environment/track-moving-objects.html

3

Have you seen this recent post?

** Tracking a point in a video **

4

Dear Christopher and Vitaliy,
Thank you so much for replying - these are very nice examples.
Marc