you can use dle fields and add videos like this, - example videobb:
First create custom field in admin and name it (for example)
vbb, then add code that you see below in your template fullstory.tpl
[xfgiven_vbb]<object id="player" width="425" height="344" classid="clsid: d27cdb6e-ae6d-11cf-96b8-444553540000" ><param name="movie" value="http://www.videobb.com/e/
[xfvalue_vbb]" ></param><param name="allowFullScreen" value="true" ></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.videobb.com/e/
[xfvalue_vbb]" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
[/xfgiven_vbb]
When adding a movie paste just a tip of link in videobb field like this:
http:// www. videobb .com/video/
C2KzgGn5Wvaaa
you can also use iframe, or flow / jw player to add videos ,- example
here
Here is a tab mod -
http://dle-en.com/hacks/1503-iframe-video-tab.html