I'm a gamer (rpgs) and I have watched some "ESports" like Starcraft, but I would never ever think of it as a sport even if it is team based. I also golf and there is much more physical activity in that then in a game.
Saying a video game is a sport seems a lot like calling a team based game show like Chain Reaction a sport...or a chess team.
Even if it became and Olympic sport I would just laugh at the thought that people think it's a sport and then watch it to see what happens
Gaming is not a sport, but it can be a competition that earns you money.