Adding existing hard-wired cameras to new Ring system

I currently have Xfinity home security service and I'm interested in switching over to Ring. I plan to buy a package from Amazon that includes doorbell camera, sensors and keypads but I'm wondering about the 2 cameras I already have wired at my house that currently go to my Xfinity system. I understand those cameras wouldn't be actively monitored by Ring but would I be able to connect them to the Ring system and check them myself. They're hard-wired and show 2 access areas to my house and I'd hate to lose them in the switch. Any advice would be appreciated.