First, you need to visit the Cal.com app store

Next, go to video conference apps, find Zoom in the list and click on details

Once the Cal.com's Zoom app page opens up, click on Install

Once you click on Install, you'll be redirected to your Zoom account (sign in if you haven't already) and allow the necessary permissions.

Now, you should be redirected to Cal.com's Installed Apps page with Conferencing Tab selected, and you should see Zoom Video in the list.

Now that Zoom Video is successfully installed in your Cal.com account, you can head to your event type settings page, add a location following this guide.

Once you have added Zoom as your event-type location, you will see it as shown in the image below. Click on Save and all your meetings should now have Zoom video as the default location.