Hello, I’m new here. And I’m learning Unity 3D for now. I just wanna ask, if this video, http://www.youtube.com/watch?v=teL_9ttQ47o, would it be possible here in unity? And, can you give me some ideas how can I make it?
And we’re doing it just like a game.
Thanks so much!
Will help so muuuuuuuch! 
That looks like it is using a morphing system, search for morph and blendshapes to find various solutions for this.
Can I do this and can someone tell me how? The answer to the first question is yes you can the second question is much bigger especially since you haven’t suggested where you are starting. Do you have experience in 3D modeling/rigging/animation? Can you code?
Blendshapes is a decent starting suggestion, but they are restrictive. You can only blend into the additional shapes you have created…If you create a properly rigged mouth and access the joints directly, it may allow you more freedom. It would be a lot more work though.
As long as you know the “poses” or the end look of the model creating blend shapes in Maya or something should work ideal for you. Unity can bake down complex simulations to keyframes as well so you could use all kinds of methods. You could simply animate deformers, you could animate influence objects, you could use joints. I think whatever will get you to the end look you want is what you should use.