The AiCam app is designed to work without requiring iCloud. You can still use AiCam even if you have disabled iCloud on your device. However, please note that some features related to iCloud, such as data syncing, may not function correctly.
If you want to use AiCam with iCloud, make sure to enable iCloud Drive for the app. This will allow you to store video recordings and other data related to AiCam in iCloud. Enabling iCloud Drive ensures that your data is securely backed up in the cloud and can be accessed from any of your devices that are signed in to your iCloud account.
The AiCam app relies on the system iCloud account of the iPhone/iPad. If you want to change the iCloud account, you will need to do that in the device's Settings app.