Hello, Tomasu. I wondered about my special interest too when I was diagnosed and, like you, I'm very involved with video games (also World of Warcraft in particular). It's as other people have said, a special interest doesn't have to be unique or strange, it has to do with the intensity of that interest.
For example, I haven't played World of Warcraft in a little over a year but I'm still largely pre-occupied with it. I follow the changes, use character creation websites, remain up to date with the latest items, mess around with talent calculators and watch WoW machinima and PvP videos.
That constitutes as a special interest, even if it doesn't seem very 'special'.