I don't know a lot about the integration between Nagios and Hyperic. From what I'm reading when you install the Hyperic agent onto a server with Nagios installed it will be able to pull information from what Nagios is monitoring into Hyperic. From Hyperic you can view quality of service and create alarms based on the Nagios monitoring. Can this information that has been pulled into Hyperic be viewed in vCOPS?
In short, yes.
Any metric that is being collected by Hyperic will be visible in vCOPS when you install the MP for Hyperic plugin for vCOPS.
You can download the plugin here: