Multiple cameras (available today) can track numerous things simultaneously. A simple version opens an iPhone!
So you can't answer the question, I know you love to portray yourself as some sort of expert in every topic you discuss, but this is one instance, along with the promotion scheme, where you are simply talking out of your hoop.
Cameras can track lots of things, but without the software they can't do anything with the images they record.
If you want to remove humans from the VAR decision making process when it comes to offside specialist bespoke software would need to be written.
That software would need to be able to differentiate between all of the players and match officials, be able to identify when a player leaves the field of play and automatically assume they are on the goal line until they re-enter the field of play.
It would need to differentiate between everysingle team in the competition, including all their kits and variations there of.
It would need to differentiate between someone's arm being offside (doesn't count if it's a part of the body that can't legally play the ball) and a foot
It would need to be able to tell whether a defending player has intentionally played the ball towards a player in an offside position.
It would need to be able to tell whether a player in an offside position has interfered with play without touching the ball i.e. blocking the goal keepers view.
It would need to be able to tell if a player in an offside position has come back inside to play the ball.
It would need to be able to tell when the goalkeeper has gone up for a corner etc.
A fancy camera is great, but a camera can't do any of that, you need software, and probably bespoke hardware as well.