Try this to set up your assessment plan. Video rubric.
Along with the easy access to video making available on your mobile, this will provide some context for discussion and assessment. Sites similar to Animoto https://animoto.com/create will help you create video but within a school division, it is best to review videos before they leave your classroom. Stick to in-house systems until all has been reviewed. Have "the discussion" with each student about the consequences of the release into public domain, even if only stored on a site. Make privacy issues a part of your classroom discussion. That discussion is essential to video vocabulary development.