This is just a video downloader that saves videos found on Facebook to your PC. You can't other's videos if you don't like them, for example. To hide a video, open your Facebook newsfeed and locate the little icon on the right side of the post then select Hide post. After you select this option, other settings will be offered like See less or completely unfollow that person.
This is the only way to "delete" a video from Facebook.
