Is Using Trailers Fair Use? How to Credit

[kluless]

Hey, guys, I have a gaming channel, and I wanted to do a comparison between the first in a series (Dishonored) and its sequel (Dishonored 2). I think using the trailer of the second game, Dishonored 2, in my video would fall under the Fair Use policy because it makes sense that I need it to make a commentary about it, but I wanted to confirm here just in case that using trailers--and not just gaming ones--falls under Fair Use.
And what about the music?

Also, how would I credit the makers of the trailer? Is setting the "game" option in the video upload section to "Dishonored" enough? What about including a sentence in my description?

Thanks!