If you remove a camera from your rockhome account, all of that camera's recorded video history will not be deleted from your account and you can still find them there.
Remove a camera from your account
1. Open the rockhome app.
2. Tap Camera Setting 
in the lower right corner of the camera you want to remove.
3. Scroll down to the bottom and tap Remove camera.
4. You will be prompted to confirm your choice.
If you want to reconnect you camera, just go through the setup process again.