getting redactor video.js plugin installed
Since the video button is supplied by a plugin, it should go under the plugins key rather than the buttons key. Your config would end up something like:
{
  &quot;buttons&quot;: [&quot;html&quot;, &quot;format&quot;, &quot;bold&quot;, &quot;italic&quot;, &quot;lists&quot;, &quot;link&quot;, &quot;file&quot;],
  &quot;plugins&quot;: [&quot;video&quot;]
}