Detection of one object among different objects

Dear community.
I have been working with the jetson TX2 since three years ago developing different robot applications.
Now, I am interested in developing a new drone application but I need to understand some basic topics in Human body detection. I know that running object detection can also detect human bodies, but here comes my question, How can I detect only one person among different people in a crowd? Or how can I select to detect only that person and ignore the others?

Hi,

Is this an object tracking problem?
Once you select which object to detect, the object tracker tends to find the same object across the frames.

Thanks.

Indeed, it is an object tracking problem.
Specifically, I want to detect the human body, and then track only that human body, for instance, if a second person appears the system should not detect him/her.