While this video is a response to the individual videos, much of what is said relates to how group videos should also be done. So it will be valuable to you as you finish up those. Also, be sure you refer to the Student Video - Best Practices document.
In the video above I refer to a student journal that features short introductory videos by students about their topics. Here is one of the student videos:
For another set of model videos, see this playlist of student videos from my class in 2015: