This tutorial provides the steps to use WP Video Popup plugin to display a YouTube or Vimeo video in a responsive lightbox popup in Oxygen.
Note: This plugin does not work with self-hosted (mp4) videos. Follow this tutorial for launching mp4s in a lightbox.
Live Demo
Step 1
Install and activate WP Video Popup.
Step 2
Edit your Page/Template in Oxygen editor having the button that should launch the video lightbox.
+ Add > WordPress > Shortcode.
Paste the following shortcode and replace the video id at the end with your desired video.
[wp-video-popup video="https://www.youtube.com/watch?v=YlUKcNNmywk"]It does not matter where the shortcode is placed as long as it is on the same page as the button.
Step 3
Click on the button/text link that should launch the video popup and add this class: wp-video-popup.