There's a web app at https://ant.umn.edu/ which lets you annotate videos; now is it possible to use VideoANT to have multiple people annotate the videos, and keep the videos shared with just the selected people while it is being produced?
There are two settings in YouTube, one is unlisted, and the other is private; unlisted leaves the videos out there, and private makes it so that you need to have someone's email address listed to view it.
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Seems OP was happy with the information he found at College of Education + Human Development: