Iframe to video posts

Hi!

I started developing a site, that has a blog section for videos. I want the possibility to play the videos before going in to the actual posts. I can do it with a plugin for youtube and etc. videos but it does no work with videos from my media library.

So i’m in need for a code snippet that can run in the loppt that displays blogposts checks if its video category than gets the vide URL from the actual post than displays it with iframe.

Thanks for the responses.