Capacity Intelligence Pack does not work if SCOM-VMM integration in not in place
If this is a requirement it should be at least documented. It doesn't say in the documentation nor in the text in the Intelligence Pack 'gallery'.
You need to enable the VMM SCOM connectivity in order to use the capacity intelligence pack. This has been documented here http://technet.microsoft.com/en-US/library/dn500856.aspx
In order to find out how to connect VMM with Operation Manager please go here
Also, if you are running 2012 SP1 and not R2, a couple more of the needed management packs are not automatically imported. these are needed to support SAN storage.
They can be found under SelectCDImage\ManagementPacks folder in the SCOM media.