There's no specific functionality built for that integration from the Meraki side. From a brief look on the Brivo side, it appears they have some documented interoperability - https://help.brivoworkplace.com/articles/cisco-meraki-integration
This does seem to basically involve Brivo solely using Meraki WiFi for uplink though. Based on the available REST APIs on both sides, I suspect there's a lot more could be done with MV cameras, via some kind of middleware. I guess it would help if you defined what you want to achieve?
Brivo do not appear to be a signed up Meraki ecosystem partner: https://apps.meraki.io/en-US/home
At least - not yet... And I don't have any experience personally with them - but open APIs is definitely the Meraki approach to interop generally - that's in good part why it's there!
Bear in mind that Cisco do offer a free trial process where you might be able to test this for a time, without any initial outlay (at least on the Cisco side)
