You might wanna be more specific..And no, sadly you are terriby wrong.."A few cosplays from video games" is nowhere near correct..A lot of them are just ones you never played..There are TONS upon TONS of video game cosplayers at kumoricon..In fact, I know for a fact there are more then a few kingdom hearts and final fantasy cosplayers because I was there with them..Not only that, but there were a lot that didn't show up for the shoot..
There can't be a "Video game photo shoot" because there are far too many people to do that. That is why it is split up by series. Whatever series you are cosplaying from, have a shoot for that.
Also, there are more then enough threads on here planning shoots for different video games, so i don't know what games you have played or heard of, but thinking only a few people cosplay gaming characters is asaying kinda a lot..