bideo-2.0.1/bideo.module

<?php

/**
 * @file
 * Batch video module.
 */

/**
 * Implements hook_theme_registry_alter().
 */
function bideo_theme_registry_alter(&$theme_registry) {
  $theme_registry['progress_bar']['preprocess'][] = 'bideo_preprocess_progress_bar';
  $theme_registry['progress_bar']['path'] = \Drupal::moduleHandler()->getModule('bideo')->getPath() . '/templates/';
  $theme_registry['progress_bar']['template'] = 'progress-bar';
}

/**
 * Implements hook_preprocess_progress_bar().
 */
function bideo_preprocess_progress_bar(&$variables) {
  $videos = \Drupal::config('bideo.settings')->get('batch_video');
  $random_key = array_rand($videos);
  $variables['video'] = $videos[$random_key];
}