从JavaScript DOM中的父节点拆分节点

I have DOM HTML like this

我有像这样的DOM HTML

<div class="width_medium">
  <p>Text 1</p>
  <p>Text 2</p>
  <div class="video">Video</div>
  <p>Text 3</p>
  <p>Text 4</p>
</div>
<d