Updated to Drupal 8.5. Core Media not yet in use.

[yaffs-website] / web / modules / contrib / video_embed_field / modules / video_embed_wysiwyg / video_embed_wysiwyg.routing.yml

video_embed_wysiwyg.video_dialog:
  path: '/video-embed-wysiwyg/dialog/{filter_format}'
  defaults:
    _form: '\Drupal\video_embed_wysiwyg\Form\VideoEmbedDialog'
    _title: 'Video Form'
  options:
    _theme: ajax_base_page
  requirements:
    _entity_access: 'filter_format.use'
    _access_video_embed_wysiwyg_filter_in_use: 'TRUE'