If you are using Zoom Chrome Extension, it will overwrite the Where and Video with Zoom. However, on your Google Calendar reminder, a Google Hangout link will still appear be automatically added to Google Calendar events. This setting can be disabled for GSuite by an admin. Users will still be able to add or remove Hangouts video call links from events, but will not be able to set their own defaults.
- GSuite Admin to disable it for your entire account