Freemius - YouTube and Vimeo Shortocdes

_responsive-container.scss

$video-max-width: 640px;
$video-max-height: 360px;

.responsive-container {
    max-width:  $video-max-width;
    max-height: $video-max-height;
    overflow: hidden;

    .responsive-container
    {
        position: relative;
        padding-bottom: 53.25%;
        padding-top: 18px;
        height: 0;
        margin: 0;

        &, iframe
        {
            max-width:  $video-max-width;
            max-height: $video-max-height;
        }

        iframe
        {
            position: absolute;
            top:      0;
            left:     0;
            width:    100%;
            height:   100%;
        }
    }
}

functions.php

<?php
/**
 * Render YouTube/Vimeo video shortcode.
 *
 * @author Vova Feldman
 *
 * @param array  $atts
 * @param null   $quote
 * @param string $shortcode
 *
 * @return string
 */
function freemius_video_shortcode( $atts, $quote = null, $shortcode = 'youtube' ) {
	$video_id = $atts[0];

	if ( 'youtube' === $shortcode ) {
		$base_url = "https://www.youtube.com/embed/{$video_id}";
		$args     = array(
			'rel'      => '0',
			'VQ'       => 'HD720',
			'light'    => 'light',
			'showinfo' => '0',
		);
	} else if ( 'vimeo' === $shortcode ) {
		$base_url = "https://player.vimeo.com/video/{$video_id}";
		$args     = array(
			'badge' => '0',
		);
	}

	return sprintf(
		'<div class="responsive-container"><div class="responsive-container-inner"><iframe width="640" height="360" src="%s" frameborder="0" allowfullscreen=""></iframe></div></div>',
		"{$base_url}?" . http_build_query( $args )
	);
}

/**
 * Add markdown special shortcodes.
 *
 * @author Vova Feldman
 */
function freemius_add_video_shortcodes() {
	add_shortcode( 'youtube', 'freemius_video_shortcode' );
	add_shortcode( 'vimeo', 'freemius_video_shortcode' );
}

add_action( 'init', 'freemius_add_video_shortcodes' );