Is there a way to obtain 3D TV output on Unity? In example, if I make a game for PC and want to have the 3D TV effect on a 3D TV like recent SAMSUNG or LG models, is there a plugin or something ready have it?
Unfortunately, Unity doesn't do 120Hz frame-sequential 3D, which is what you need for most of the 3D TVs and monitors out there these days. But most of the 3D TVs will take a 1080p or 720p side-by-side format & convert it to 120Hz sequential (active glasses) 3D - because that's one of the formats for 3D blu-ray.
You can do side-by-side and just about every format except 120Hz with this package that I've put together (unity pro only):
http://forum.unity3d.com/threads/63874.
But if you want native 120Hz 3D (of course you do!), vote for it on the Unity Wish List:
http://feedback.unity3d.com/forums/15792-unity/suggestions/593389