Create non public videos and deal with user groups
What defines whether a video is public or not is the group of users associated with it.
If a video has no associated user group, it means that this video is public.
If you have one or more associated groups the video will cease to be public and only the users who are also part of this group will be able to view the videos.
To associate a video with a group of users, you must go on the editing screen of this video and in the editing window uncheck the public option, below this option will be listed the groups of users available.
You can specify 1 or more user groups to a category.
If you select one or more user groups, the video you associate with this category will be automatically private and only users from those user groups will be able to play the video.
To associate a user with a group, the process is similar to videos, when editing the user you can choose the groups to associate with it.
This process of group association with users can also be automatic, with the use of Subscription Plugin or the PayPerView Plugin
If you want to protect and deny access to the video file, even if the user has the direct URL to the MP4 file look for the SecureVideosDirectory plugin, the details here