Hi.
If you are referring to Wix Video, please note that you can only do what is in the settings.
If you are using the standard video player you can use the V ideoPlayer API to record if a user has watched the video with onEnded() event, then update status of after adding a field to your database. For example, you can add a boolean field called Watched to your database and update the status to true with the onEnded event. Same for onPause and the rest which you can find in the API.
You can then filter your videos on the watched or any other field and display the watched ones in a separate repeater or any other element.
Good luck!