Jackson Whelan

Allows you to paste iframe codes in the visual editor, just enclose within the [iframe][/iframe] shortcode.

iframe Shortcode

Paste iframe embed codes into the visual editor.

firimar

This basic plugin adds the Magnific Popup lightbox script to wordpress site and works with single images, iframe links and dialogs.
All you need to do to use Magnific Popup on a link is to add specific css class to ‘a’ tag. CSS class names can be configured on settings page.
For images you can use alt attribute to add captions.
Thanks to Dmitry Semenov for the original script: http://dimsemenov.com/plugins/magnific-popup/
This plugin is only basic version and does not support all features of Magnific Popup yet.
Plugin provides following functionality:
<ul>
<li>Single image popup.</li>
</ul>
Usage example html: 
 <a href="http://site.com/full-size.jpg" rel="nofollow ugc"></a>
<ul>
<li>Image gallery popup with navigation.</li>
</ul>
Usage example html:
 <a href="http://site.com/full-size-1.jpg" title="title1" rel="nofollow ugc"></a> 
 <a href="http://site.com/full-size-2.jpg" title="title2" rel="nofollow ugc"></a> 
 <a href="http://site.com/full-size-3.jpg" title="title3" rel="nofollow ugc"></a> 
 <a href="http://site.com/full-size-4.jpg" title="title4" rel="nofollow ugc"></a>
<ul>
<li>Iframe popup (can contain external page, youtube video, google map, etc.)</li>
</ul>
Usage example html: 
 <a href="http://www.youtube.com/watch?v=b0FhD19zj4I" rel="nofollow ugc">Video</a> 
 <a href="https://maps.google.com/maps?q=221B+Baker+Street,+London,+United+Kingdom&hl=en&t=v&hnear=221B+Baker+St,+London+NW1+6XE,+United+Kingdom" rel="nofollow ugc">Google Map</a>
<ul>
<li>Dialog popup (pops up a div from the current page)</li>
</ul>
Usage example html: 
 <a href="#dialog" rel="nofollow ugc">Dialog
 Test dialog content
 </a>

WP Magnific Popup

Plugin to add the Magnific Popup lightbox script to wordpress site for single images, image galleries, video, maps, dialog popups and other.

iframe Shortcode vs WP Magnific Popup