Video Embed is a very useful module for Drupal 8 users.
Video Embed creates a field type that allows you to embed videos from YouTube, Facebook, Vimeo, Vine and many other sources. All you have to do is enter the video URL and this module will do the rest.
Video Embed will create a thumbnail preview, control the autoplay settings and also ensure that the video is responsive.
In this video from our Drupal 8 Site Building class, Rod shows us how to use Video Embed: