Is there a way to install ASP.NET MVC 5 in Visual Studio 2012?
I've tried using NuGet (http://www.nuget.org/packages/Microsoft.AspNet.Mvc). But I think that it should come as a Visual Studio extension, but I can't find that anywhere.
Or it is available only in Visual Studio 2013?
Microsoft has provided for you on their MSDN blogs: MVC 5 for VS2012. From that blog:
We have released ASP.NET and Web Tools 2013.1 for Visual Studio 2012. This release brings a ton of great improvements, and include some fantastic enhancements to ASP.NET MVC 5, Web API 2, Scaffolding and Entity Framework to users of Visual Studio 2012 and Visual Studio 2012 Express for Web.
You can download and start using these features now.
The download link is to a Web Platform Installer that will allow you to start a new MVC5 project from VS2012.