An addiction is defined by two things : first, it has negative effects on your life. Second, trying to stop it makes you miserable.
Food for example is not an addiction, it's a biological need. The need for socialisation is another one.
Video games can be an addiction. But I'd argue that they're usually not, they usually a coping mechanism. When they are, the problem is elsewhere, and the video games are helping you to survive through the problem.