Video Post formate in feature image

// Video Post formate  in feature image

function wpb_filter_featured_image_to_video( $html, $post_id = 0 ) {

  global $post;
  if ( isset($post) && !empty($post) ) {
    $x = get_post_meta( $post->ID, 'your_meta_field_id', true); // Here we need to call the metabox that contain the embed code
    if (strlen($x) > 0)
      return $x;
  }

  return $html;

}

if (!is_admin())
add_filter( 'post_thumbnail_html', 'wpb_filter_featured_image_to_video' );