Do video effect your brain?

Your question is very vague, that's why you will be receiving a vague response. In my opinion, it depends on what kind of video it is. If you are focusing on miscellaneous videos then yes I suppose so, because my personal experience, watching random videos on YouTube has totally annihilated my thought process. However if you are talking about education videos like documentaries and Discovery channel type videos, then no they won't affect your brain negatively.