Solution: Different Widgets for Different Sizes

import 'package:flutter/material.dart';

class VideoPlayer extends StatelessWidget {
  const VideoPlayer({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(builder: (context, constraints) {

      return Column(
        children: [
          ConstrainedBox(
            constraints: BoxConstraints(maxHeight: constraints.maxHeight),
            child: AspectRatio(
              aspectRatio: 16 / 9,
              child: Container(
                color: Colors.black,
                child: const Center(
                  child: Icon(
                    Icons.play_circle,
                    color: Colors.white,
                  ),
                ),
              ),
            ),
          ),
          const VideoDescription(),
        ],
      );
    });
  }
}


class VideoDescription extends StatelessWidget {
  const VideoDescription({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: const [
          Text(
            'Video Title',
            overflow: TextOverflow.ellipsis,
            style: TextStyle(fontSize: 24),
          ),
          Text(
            'Video description',
            overflow: TextOverflow.ellipsis,
            style: TextStyle(fontSize: 18),
          ),
          Text(
            'Likes: 34',
            overflow: TextOverflow.ellipsis,
            style: TextStyle(fontSize: 16),
          ),
        ],
      ),
    );
  }
}