title: Smartest input to <iframe> for youtube, vimeo, ..?
body: <p>I would like to add an option for users to add a link to a video to insert into the post.</p>
  
  <p>The thing is that for users sometimes this might be confusing, this value could be:</p>
  
  <ul>
  <li>The actual video embed code</li>
  <li>The link of the embed iframe (src)</li>
  <li>The link of the video in the site</li>
  </ul>
  
  <p>Is there any plugin that checks and turns any of those into the embed code? Of course I could try to implement this, but getting to a stable solution could be slow, and there won't be a point if there is any public feature alike</p>
  
  <p>Any workarouds like this?</p>
  
  <p>I remember of jquery oembed, but this was only working for second option I think</p>