Setting a tracker for effects help!!!

Need help!!! How do I put a tracker on the below project. I downloaded the practice intro file and saw the tutorials but on my project somehow cant grasp / create that or rather have no grasp of how to create a tracker to keep several sparks fixed on the train wheel as this is a handheld shot.
What would be the next step based on my screenshot?
Thanks!
Robert
www.screencast.com/t/ekuhhGMX

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