Talking [Q] Screen Mirroring Problem

OK, So I have Nexus 7 2 and I am just loving it. I just bought Samsung Smart TV, and, of course, loving it too . I actually wanna screen mirror b/w my nexus 7 running Android (of course :3) 4.3.3. When I go to Setting -> Display -> Cast Screen, My TV DOES APPEARS their. Whenever, I connect it ofcourse wont. Yes, I did go to Developer Options and, over there selected Certificate something. And again in Display, I selected "Enable autonomous GO". Whenever my TV says Connecting To Android XXXX, and the cast icon appears on my Nexus 7 notification bar, MY TV JUST SWITCHES TO TV (NORMAL MODE).

Don't tell me it isn't possible, as this person did here, using nexus 7 and Samsung TV
www.youtube.com/watch?v=llQsJbrwR5k
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