I’m thinking about subscribing to the Aqara HomeGuard plan.
Before I do, I’d like to know: will HomeKit Secure Video continue to work normally, or can both HomeGuard and HomeKit Secure Video be used together at the same time?
Both work together regardless if you use HomeGuard. I used both without and then later signed up for HomeGuard and nothing changed other than gaining all the HomeGuard features on all my Aqara Cameras.