The 6000 Dollar Plugin
You can get a demo from them which is pretty nice.
Just write an email. Its the best video player arround, just not sure whats the difference between the demo and full version.
Anyways, if you search a fast one just pick H264 or VP8 (WebM) as codec.
There are lots of libraries online which can render / extract image and sound so you only have to render the image to a texture and playing the sound. Thats still alot of work, so you should be sure you really need it.