The Director Peter Jackson is on record saying that eventually movies and video games will blend together so there will just be levels of narrative and levels of participation. Game engines themselves are getting so good that they in turn are encroaching on the kinds of visual effects that could only be done by a Wetta Workshop or Industrial Light and Magic. The big difference is that a game engine does it in real time, instantly. There is no renderfarm making a frame an hour. Here is a demo from Unreal Engine 4. But there are demos out there for the other main engines like Unity or even the upcoming Source 2 engine from Valve. The engines are free to download and develop with.