Depending on applied jurisdiction (the law of country), meeting attendees have to or don't have to give a consent to record video call or voice call.
Users can give 2 types of consent:
Explicit consent - user have to confirm he agrees with something. For example, in displayed pop-up, user have to confirm that he agree with call recording, by clicking on "Yes".
Implied consent - is a consent granted by user's actions. For example, user can see the notification, that call is recorded. If he stays on the call, he agrees with recording.
In Google Meet, meeting attendees get a notification that call is being recorded. They get a notification as well when the recording stops.
In Microsoft Teams, meeting attendees are also notified when call is recorded.