Of course video games can be an addiction. Just look into how the brain works, any behavior can become compulsory and morph into an addiction.
Besides drugs, video game, internet (youtube etc) are really potent generators of dopamine because they designed to do just that, provide pleasure in high quantities and intensity. Plus they are introduced pretty early in our childhood in the years when our brains are the most vulnerable and susceptible to create detrimental neural connections.
Good thing they finally realize it. But the U.N. Health Agency and the world in general aren't ready for what's to come. When the babies we're raising right now grow up and phone/tablet/screen addiction hit full force, we're gonna see interesting stuff and takes on technology and how it affects behaviors. Parents' laziness will be fully exposed and a lot of people are going to regret how much they thought an electronic device could raise an human being. shyt's going to blow up in their faces.