function background_video_page_attachments in Background Video 8
Implements hook_page_attachments().
File
- ./background_video.module, line 23 
Code
function background_video_page_attachments(array &$attachments) {
  /** @var \Drupal\background_video\Manager\BackgroundVideoManager $manager */
  $manager = \Drupal::service('background_video.manager');
  // Pass the BackgroundVideoManager settings.
  $attachments['#attached']['drupalSettings']['background_video'] = $manager
    ->getJsSettings();
  //var_dump($attachments['#attached']);
  // Load the Background Video js library.
  $attachments['#attached']['library'][] = 'background_video/background_video';
}