FullscreenButton

import { createPlayer, FullscreenButton, features, Video } from '@videojs/react';

import './BasicUsage.css';

const Player = createPlayer({ features: [...features.video] });

export default function BasicUsage() {
  return (
    <Player.Provider>
      <Player.Container className="fullscreen-button-basic">
        <Video
          src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4"
          autoPlay
          muted
          playsInline
          loop
        />
        <FullscreenButton
          className="fullscreen-button-basic__button"
          render={(props, state) => <button {...props}>{state.fullscreen ? 'Exit Fullscreen' : 'Fullscreen'}</button>}
        />
      </Player.Container>
    </Player.Provider>
  );
}

.fullscreen-button-basic {
  position: relative;
}

.fullscreen-button-basic video {
  width: 100%;
}

.fullscreen-button-basic__button {
  padding-block: 8px;
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  color: black;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 9999px;
  padding-inline: 20px;
  cursor: pointer;
}

<video-player class="fullscreen-button-basic">
    <video
        src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4"
        autoplay
        muted
        playsinline
        loop
    ></video>
    <media-fullscreen-button class="fullscreen-button-basic__button">
        <span class="show-when-fullscreen">Exit Fullscreen</span>
        <span class="show-when-not-fullscreen">Fullscreen</span>
    </media-fullscreen-button>
</video-player>

.fullscreen-button-basic {
  display: block;
  position: relative;
}

.fullscreen-button-basic video {
  width: 100%;
}

.fullscreen-button-basic__button {
  padding-block: 8px;
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  color: black;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 9999px;
  padding-inline: 20px;
  cursor: pointer;
}

.fullscreen-button-basic__button .show-when-fullscreen {
  display: none;
}
.fullscreen-button-basic__button .show-when-not-fullscreen {
  display: none;
}
.fullscreen-button-basic__button[data-fullscreen] .show-when-fullscreen {
  display: inline;
}
.fullscreen-button-basic__button:not([data-fullscreen]) .show-when-not-fullscreen {
  display: inline;
}

import '@videojs/html/video/player';
import '@videojs/html/ui/fullscreen-button';