Annoyingly there is no way to monitor App-V deployments though SCCM Reports like you can with software distribution of other SCCM packages. However you can get a drill down report of what succeeded, fail and is in progress of App-V package deployments from the Deployments section, listed under Monitoring.
To report on App-V deployments in SCCM 2012:
Launch SCCM 2012 Console
Go to the Monitoring section
Click on Deployments
Search for the App-V deployment that you wish to report on
Right click the App-V deployment
Click View Status
You will then be able to see reports on deployments of the App-V package. Clicking on deployment categories will then give you info about what failed / succeeded, etc. and the reason for any failures.