flutter-quill/example/lib/screens/quill/samples/quill_videos_sample.dart

const quillVideosSample = [
  {'insert': '\n'},
  {
    'insert': {'video': 'https://youtu.be/xz6_AlJkDPA'},
    'attributes': {
      'width': '300',
      'height': '300',
      'style': 'width:400px; height:500px;'
    }
  },
  {'insert': '\n'},
  {'insert': '\n'},
  {'insert': 'And this is just a youtube video'},
  {'insert': '\n'},
  {
    'insert': 'This sample is not complete.',
  },
  {'insert': '\n'},
];