I actually don't think video games have much to do with this at all. For the most part, when I'm gaming (I pretty much only play DODs), I'm trying to completely focus my energy and attention on the game. Maybe there's an element of constant, instant gratification that comes from respawning and doing it all over again every 30 seconds... But honestly I think gaming can really help develop focus and discipline. (Not to mention great mouse & keyboard skills
None of us got good at DODs simply because we keep playing. Sure it's fun, but we get good at it because we want to be good at it. We strive to improve. We keep pushing ourselves, and we put in the hours necessary to improve. If we apply this to any other part of our lives, it will improve too.
The real value of this video's message is that you have to FOCUS on one thing at a time to really deepen your ability in it. Make time for shit that's important to you, and put in the hours.