This extension includes the HTML5 video tag as kirbytext and has several optional parameters. It accepts input of .ogg, .webm and custom fallback. If you don't choose width and height, it picks the one in the config.php file. It also supports class and title.

kirby_video.php

<?php
 
class kirbytextExtended extends kirbytext {

	function __construct($text, $markdown=true) {

		parent::__construct($text, $markdown);
 
		$this->addTags('video');
 
		$this->addAttributes('width', 'height', 'ogg', 'webm', 'class', 'title', 'fallback');

}
	
function video($params) {

	global $site;

	$page = ($this->obj) ? $this->obj : $site->pages()->active();
	$video = $page->videos()->find($params['video'])->url();

		$defaults = array(
			'width' => c::get('kirbytext.video.width'),
			'height' => c::get('kirbytext.video.height'),
			'ogg' => '',
			'webm' => '',
			'fallback' => '',
			'title' => '',
			'class' => ''
		);

	$options = array_merge($defaults, $params);

		$class = $options['class'];
		$title = $options['title'];
		$ogg = $options['ogg'];
		$webm = $options['webm'];


	// add a classname to the video
	    if(!empty($class)) $class = ' class="' . $class . '"';
	// add a title to the video
		if(!empty($title)) $title = ' title="' . $title . '"';
	// add an OGG video
		if(!empty($ogg)) $ogg = '<source src="' . $page->videos()->find($ogg)->url() . '" type="video/ogg">';
	// add a WebM video
		if(!empty($webm)) $webm = '<source src="' . $page->videos()->find($webm)->url() . '" type="video/webm">';

	// return the full code

	return '<video width="' . $options['width'] . '" height="' . $options['height'] . '"' . $class . $title . 'controls><source src="' . $video . '" type="video/mp4">' . $ogg . $webm . $options['fallback'] . '</video>';
	}
}

?>

Exactly what I was looking for. Thanks!

is it for /site/plugins?! and how can i use it?! (video:movie.mp4 webm:movie.webm title: Demonstrating the video tag)