How to pass detection meta-information through the tracker? about motpy HOT 3 OPEN

@cansik If you need to know which detections (from current frame) were matched with which single object trackers, you can look at matches here: https://github.com/wmuron/motpy/blob/master/motpy/tracker.py#L399 - just make them accessible as a class member or just return both active tracks and matches.

If you want the property you have in mind to be a part of a Track (kind of a "state"), you need to modify the Track, Tracker and Detection classes to contain such information; also it'll require you to provide the logic of how to apply the "update" step.

Anyway, both approaches require doing small modifications by you in the motpy library.

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@wmuron Thank you, would you be open for a PR if I am going to add this functionality in a way that the current API is still valid? Or would I have to publish my own package to be used in my projects?

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I tried to implement it with a public matches attribute, but this is not working because the tracker list is changed after the matching, so the indexes are wrong.

It was necessary to add a reference field to the trackers and the track output to being able to later match input detections to trackers.

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