Video Tag

Is there a tag for a picture that comes from a nico video or youtube video? If not can one be created?

It becomes exceedingly difficult to find, for example, vocaloid pictures from videos since there is so much to sift through.

I've looked through the tag list and found that nicovideo and video are already in use, but for flash videos and such.

What do you mean by "comes from"? Like, a meme that orignated in a Niconico video? That would be tagged with whatever the specific meme and copyrights are. And often their real origin may be elsewhere. Is there something specific you're looking for?

Are you looking for screenshots?

Yes exactly, screenshots. I've seen some posts with links to the nico video below it. I would like to find those pictures, and at the same time the videos, again.

Well, you could start by searching the comments for "nicovideo.jp".