Hello shrinand ,
so we don't have YOLO-X on-device decoding support (like for yolo3/4/5), and decoding is usually done on the host (example here). Tracker only works with ImgDetections, so you would have to construct that object and assign bounding box to it, then send it back to the device to run tracking on it.
So it might be easier to either switching to different model, or running object tracker on the host.
Thanks, Erik