VimeoBackground.php

<?php

class VimeoBackground {

	public function __construct(){}

	public function do_shortcode()
	{
		add_shortcode( 'vimeobackground', array($this, 'vimeo_wrapper'));
	}

	public function style($boxed = false)
	{
		// se for pra ficar dentro de alguma div, use relative
		// se for pra ficar fixo, use ... you got it!
		$position = $boxed ? "relative" : "fixed";
		
    echo "<style>
		.vimeo-wrapper {
		   position: " . $position . ";
		   top: 0;
		   left: 0;
		   width: 100%;
		   height: 100%;
		   z-index: -1;
		   pointer-events: none;
		   overflow: hidden;
		}
		.vimeo-wrapper iframe {
		   width: 100vw;
		   height: 56.25vw; /* Given a 16:9 aspect ratio, 9/16*100 = 56.25 */
		   min-height: 100vh;
		   min-width: 177.77vh; /* Given a 16:9 aspect ratio, 16/9*100 = 177.77 */
		   position: absolute;
		   top: 50%;
		   left: 50%;
		   transform: translate(-50%, -50%);
		}</style>";
	}

	public function vimeo_wrapper($att)
	{
		if (array_key_exists("video", $att)) {

			if (array_key_exists("boxed", $att))
				$this->style(true);
			else $this->style();

			return sprintf('<div class="vimeo-wrapper"><iframe src="https://player.vimeo.com/video/%s?background=1&autoplay=1&loop=1&byline=0&title=0"
           frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe></div>', $att['video']);
		} else
		{
			return "Atributo 'video' not foi especificado no shortcode";
		}
		
	}
}