Unfortunately, idMatcher is a bit
unstable and we don't have the resources to maintain it properly. A
trick you can use is to do the job with idTracker itself: Rename your
two videos with the same name followed by consecutive numbers (e.g.
video1.mp4, video2.mp4), so that idTracker believes they are a single
video. Then, it will extract a common set of references for both videos
and will track them both with the same identities.
tracking quality may be lower than the one you would obtain using
idTracker on each video and then idMatcher, so you may want to also
track each video separately (although you may also get high enough
quality from the common tracking, it depends on the video
I hope this helps!