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Dynamic tracking, with the head mounted on a piezo crystal, was a big factor in making C format work. The head could be moved up and down to follow the video racks exactly. It solved the otherwsie mediocre interchange of A format and allowed still frame etc.
Incidentally, when dynamically tracking the output of the video head is maximum when it's spot on the middle of the track. How does the system know it's at maximum? (I know the answer but the question is interesting because it's similar to some other optimisation problems, including running photovoltaics at maximum power output)
At least one doemstic format (Philips V2000) used a similar idea.
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