You can embed your videos from video-sharing websites into a Page or Post, but you should not upload your video files directly into the WordPress media library.
The theme has a mobile-friendly Video content type for Pages built in, but WordPress also has native functionality for YouTube and Vimeo videos. Paste your video URL into any WordPress text box, and the video will display but will be limited by the space the text box occupies.
***Please make sure there is closed captioning available on all videos for hearing impaired users.***