Well, it is actually suitable to submit live action videos to NG if you want to submit it here, in fact there are many live action videos in NG, such as the video Kojima Leaves Konami, and many other videos that I have forgotten their names. The main thing is that whether the video itself is good or not is just up to viewers to vote it otherwise you are free to submit any media that contain animated scenes in it.
Mattashi
Isn't Newgrounds a place for artists? To me comedy/movies is an art form as well.
I think it would be suitable for NG, why not :)
Lambtaco
I just get the impression live action stuff is frowned upon, I suppose. Unless somebody who is already big does it.