Your meeting link can be included in the booking and reminder messages that are sent to patients by adding it to your messages.
To do this select Business Setup -> Your Clinic from the navigation bar on the right hand side.
Scroll down to your Message Settings select the Booking Email and reminder email tab and from the Service Category select box choose the Service Category of the service that has video conferencing enabled.
Ensure that your message contains the tag {{event.join_url}}.
This tag will be replaced with the link for the patient to join the meeting.