val config = ZegoUIKitPrebuiltCallConfig()
config.turnOnCameraWhenJoining = true
val fragment = ZegoUIKitPrebuiltCallFragment.newInstance(yourAppID, yourAppSign, callID,user.userID, user.userName, config)
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, fragment).commitNow() 

let config: ZegoUIkitPrebuiltCallConfig = ZegoUIkitPrebuiltCallConfig()
config.turnOnCameraWhenJoining = true
let callVC = ZegoUIKitPrebuiltCallVC.init(yourAppID, appSign: yourAppSign, userID: user.userID, userName: user.userName, callID: callID, config: config)
callVC.modalPresentationStyle = .fullScreen
self.present(callVC, animated: true, completion: nil) 

<script>
    const yourAppToken = '';
    const zp = ZegoPrebuiltUIKit.create(yourAppToken);
    zp.joinRoom({
        container: document.querySelector("#root"),
    });
</script> 

export default function CallPage(props) {
    return (
        <View style={styles.container}>
            <ZegoUIKitPrebuiltCall
                appID={yourAppID}
                appSign={yourAppSign}
                userID={user.userID}
                userName={user.userName}
                callID={callID}
                config={{
                    turnOnCameraWhenJoining: true
                }}
            />
        </View>
    );
} 

class CallPage extends StatelessWidget {
    const CallPage({Key? key}) : super(key: key);

    @override
    Widget build(BuildContext context) {
        return ZegoUIKitPrebuiltCall(
            appID: yourAppID,
            appSign: yourAppSign,
            userID: user.userID,
            userName: user.userName,
            callID: callID,
            config: ZegoUIKitPrebuiltCallConfig(turnOnCameraWhenJoining: true),
        );
    }
}