To use Wordpress native player Mediaelement.js inside your theme you can implement any of the methods below:
- If using HTML5, simply add the video using
<video>
tag, rest all Wordpress will take care of it. - Use
do_shortcode('[video src="video-source.mp4"]')
- Use
wp_video_shortcode( $attr )
where$attr
is the attribute of the video shortcode.
Also you should have the correct version of Wordpress that support Mediaelement.js as their native player (as old versions don't)