Welcome! Cammy is a monitoring service, not a device. They use a variety of cameras made by other manufacturers. Right now in the UK they are featuring the penguin and the Nighthawk camera. But they can work with some other cameras as well.
If you want to use the smart home monitor feature of SmartThings, there is only a very small number of cameras that will allow you to view videos through the app. I don’t know if Cammy works with any of the SmartThings-supported models, but I think it might. I believe Cammy will work with any IP based camera.
So you would not be able to use the two cameras that Cammie is selling on their site. But you might be able to buy one of the cameras that works with SmartThings and then also use it with Cammy.
Here’s the unfortunate thing: what Cammy is really selling you is their own software which analyzes the photo stream from the camera and is supposed to reduce false alarms. Unfortunately, I’m not sure that feature will be available to the SmartThings’ use of the camera. One of the camera gurus would have to look at it and see.
So I think it quite likely that you could subscribe to the Cammy service, use a camera that would also work with SmartThings, and get monitoring alerts from Cammy while also being able to use the camera with the SmartThings smart home monitor feature. But I don’t think you’ll be able to use the Cammy “no false alerts” feature to screen out false alarms on the SmartThings’ side.
But hopefully some of the community members who do a lot with cameras would be able to say.