gistfile1.aw

<?php
class AMM_Template_Tags {

	public function __construct() {}

	public function display_featured_video()
	{
		$amm_options = get_option( 'amm_options' );
		$video_url = $amm_options['featured_video']; // http://www.youtube.com/watch?v=S-PcsfPPUsE
		if( !$video_url )
			return false;
		echo do_shortcode('[embed]' . $video_url . '[/embed]' );
	}
}
$ammtt = new AMM_Template_Tags

function test()
{
	global $ammtt;
	$ammtt->display_featured_video();
}
add_action('genesis_before_content', 'test');