Record themselves while watching the clip (the extension can record both screen and camera with sound). At the and, or in a follow up video, you could continue with a mailtimer game where the video could be at stake, or you could ask the viewers to simply send the video at the end.

Record themselves while watching the clip (the extension can record both screen and camera with sound). At the and, or in a follow up video, you could continue with a mailtimer game where the video could be at stake, or you could ask the viewers to simply send the video at the end.