使用javascript动态更改视频，并使用bootstrap在浮动窗口上播放

<video id="myVideo" controls>
  <source src="path/to/video.mp4" type="video/mp4">
</video>

var video = document.getElementById("myVideo");

video.play();

video.pause();

video.currentTime = 10;

<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#videoModal">
  打开视频
</button>

<div class="modal fade" id="videoModal" tabindex="-1" role="dialog" aria-labelledby="videoModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="videoModalLabel">视频播放</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        <video id="myVideoModal" controls>
          <source src="path/to/video.mp4" type="video/mp4">
        </video>
      </div>
    </div>
  </div>
</div>

var modal = document.getElementById("videoModal");

// 显示Modal
modal.style.display = "block";

// 隐藏Modal
modal.style.display = "none";

var videoModal = document.getElementById("myVideoModal");
videoModal.play();