The WordPress Lightbox Ultimate plugin allows you to embed your media files (images, videos, mp3 etc) using lightbox overlay display similar to the one shown below

• This plugin can be used to display images, mp3, mp4, flash, YouTube, Vimeo, Viddler videos in a lightbox popup. It can also be used with videos hosted on your Amazon S3 account.

Videos embedded with this plugin will impress your visitors!

 

More details here.