OpenCV AttributeError module ‘cv2.cv2’ has no attribute ‘Tracker_create’

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It depends on which packages of OpenCV and the version you have installed.

I believe you need OpenCV 3.4+ to run those models. Some tracker models are available in 3.2, and 3.3. All trackers in your script are available in 3.4

OpenCV packages:
opencv-python: This repository contains the main modules of the OpenCV library.

opencv-contrib-python: The opencv-contrib-python repository contains both the main modules along with the contrib modules

python -m pip install opencv-contrib-python, check to see if you have 3.4+, with pip show opencv .

See how to install opencv for more details

Updates

As @user48956 pointed out opencv v 4.5.x has moved some of these algorithms to cv2.legacy. For example, to access TrackerMOSSE_create function. You would have to get it fromcv2.legacy.TrackerMOSSE_create.

I would recommend keeping up with opencv GitHub as some functions/algorithms will likely move around or be deleted.

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