ultralytics/docs/en/macros/track-args.md

Argument	Type	Default	Description
source	str	None	Specifies the source directory for images or videos. Supports file paths and URLs.
persist	bool	False	Enables persistent tracking of objects between frames, maintaining IDs across video sequences.
tracker	str	botsort.yaml	Specifies the tracking algorithm to use, e.g., bytetrack.yaml or botsort.yaml.
conf	float	0.3	Sets the confidence threshold for detections; lower values allow more objects to be tracked but may include false positives.
iou	float	0.5	Sets the Intersection over Union (IoU) threshold for filtering overlapping detections.
classes	list	None	Filters results by class index. For example, classes=[0, 2, 3] only tracks the specified classes.
verbose	bool	True	Controls the display of tracking results, providing a visual output of tracked objects.