My guess is that the comments box is directly related to the content on the view_video page, ie: the video ID

You might try searching the 'net for a similar script that you can insert into the extra page you want to create, unless the comments box is for something specific and I think the comments boxes in vShare relies on the ID of the video/user that the comment is being made about. There was something posted previously about how to get a person's profile pic to appear on the view_video page. Try that thread as well.

If the comment box you want to use is not related to a specific thing like the video or the user, try searching the 'net for a freebie javascript that will do the same thing.