Can Canon AF do real time tracking of objects (not just faces,eyes,cars,animals etc)?

Not sure why you think that Nikon is not good at doing this. I found Nikon to actually be much better than Canon in this regard.

Check this video to see Z6 (I!) tracking capabilities on random objects (Will start at the correct timestamp):

https://www.youtube.com/watch?v=M9KFtf_xHYo&t=109s

Unfortunately Nikons AF speed is not sufficient to keep the subjecte in focus, but the tracking itself is really good. Exactly as you describe actually (select, recompose, shoot).

Canon is not that good in that regard. In complex engironments (e.g. when not shooting birds against the blue sky) the focus points tends to drift. It will work for a limited time and then you will have to re-adjust. Focus points will often drift first over the selected object and later on might get lost entirely on back- or foreground. The later cameras show some improvement in this regard (R6 II) but they are still far from Nikons or Sonys performance. AF speed is certainly fast enough though. On top their implementation is a bit weird, as you are able to choose the initial focus point but upon activating tracking the shape and size of the focus area might shift immediately to something that the camera seems to like better. With Nikon it always stays a yellow rectangle, with Canon any combination of small focus fields is possible.

So in my experience:

- Sony: Can do both (tracking + fast focusing)

- Canon: Can do the fast focusing part, tracking has room to improve

- Nikon: Can do the tracking quite good (at least to the point where AF struggles to keep up with the chsoen focus are, if this gets too blurry then tracking will fail), focusing is too slow for somewhat faster subjects