resizeVideos.js

function resizeVideos() {
	var $allVideos = $("iframe[src^='https://player.vimeo.com'], iframe[src^='https://www.youtube.com'], object, embed");

	$allVideos.each(function() {

	  $(this)
		// jQuery .data does not work on object/embed elements
		.attr('data-aspectRatio', this.height / this.width)
		.removeAttr('height')
		.removeAttr('width');

	});

	$(window).resize(function() {

	  $allVideos.each(function() {
		var newWidth = $(this).parent().width();
		var $el = $(this);
		$el
			.width(newWidth)
			.height(newWidth * $el.attr('data-aspectRatio'));

	  });

	}).resize();

}