This tiny plugin allows you to embed online video from YouTube, Vimeo and more media for a responsive layout - they scale according to the screen size
responsive-videofolder to the
The shortcode can use the attributes 'align', 'aspect_ratio', 'width' and 'autoplay'.
You will find a 'Responsive Video' menu in your WordPress settings. There are no settings to configure, so it contains a detailed tutorial on how to use the shortcode.