What you're looking for is the utility "OIG" that ships with Incisive. Its full title is OVM Interface Generator.
This utility helps you to wrap an eVC with a SV API, so that you can use it in an OVM-SV testbench.
Search for OIG or OIC (OVM Interface Configurator) in the cdnshelp tool.
You might want to talk to your local Cadence AE who can guide you through the process (ping me your email address if you want help finding your local AE).