Selecting the Trackers
Make sure all the Trackers are selected before you start the analysis. (To select several Trackers at once, Shift-click each one, or click Select All Trackers in the Tracker panel.)
Only selected Trackers perform analysis. In most cases you want all Trackers selected; however, some times you may want only some of the Trackers active. For example, if some of the reference features present difficulties, you might first analyze all the non-problematic reference features, and then track each problem reference feature individually.