You can have a list field on the user called “Reviewed Videos” that is a list of your Video data type. When Submit is clicked:
Action 1: Create Review (or whatever your process is for the actual review part)
Action 2: Hide Form
Action 3: Make a change to current user > Reviewed Videos add Video
However you’re referencing the video being reviewed, use that reference in Action 3. For example “Reviewed Videos add Current Page Video” if the page is type Video or “Reviewed Video add Current Cell’s Video” if in a repeating group. Hope this makes sense.
Then in the area where users see what they have to review, filter out this list field. For example, if it’s a repeating group, the source would be “Search for Videos” with a constraint “unique ID isn’t in Current User’s Reviewed Video’s unique ID”
Again, a few different ways to make this happen. Instead of having the list on the user, you could alternatively have a User list on the video Thing and add the User to that list instead, “Reviewed by” or something. So the Search for Videos constraint would instead be “Reviewed by doesn’t contain current User”