You can enable Power View for SharePoint by installing and configuring the Reporting Services add-in for SharePoint 2013. There is a good guide for installing and configuring the BI features of SharePoint 2013 here. If you already have BI features on your SharePoint farm, here's how to configure Power View.
Basically, you need to:
- Install SQL Server 2012 SP1 CTP3
- Uninstall Report Services - Native if you have installed it
- Install Reporting Services – SharePoint & Reporting Services Add-In for SharePoint Product
- Install Analysis Services In Tabular Mode and Data Tools Install SharePoint Reporting Service
- Install and Configure Power Pivot for SharePoint
- Configure Performance Point Services
- Configure Reporting Services
- Check SharePoint Power Pivot Integration
Be aware that the data source for Power View must be a Power Pivot model, SSAS Tabular Model, or SSAS Multidimensional model (Power View for SharePoint only, must have SQL Server 2012 SP1 CU4).