omniamike

// Load Child Theme Specific JS

function load_child_javascript_files() {
	wp_register_script('filename', get_stylesheet_directory_uri() . '/js/filename.js', array('jquery'), true );
	wp_enqueue_script('filename');
}

add_action('wp_enqueue_scripts', 'load_child_javascript_files');

omniamike

<script type="text/javascript">
  jQuery(document).ready(function($) {
    $('.video-modal').magnificPopup({
      type: 'iframe',
      mainClass: 'mfp-fade',
      removalDelay: 160,
      preloader: true,
      fixedContentPos: false
    });
  });