In macOS Sonoma (14.x), Apple introduced the concept of video reactions - on-screen effects inserted into the camera video stream by the operating system. These are distinct from Zoom meeting reactions, such as raise hand, that are part of the Zoom application and meeting experience.
At present (November 30th, 2023), Apple does not provide a mechanism for an administrator to enable/disable reactions on a system-wide basis, or for an application such as Zoom Rooms for Mac to programmatically enable/disable the use of macOS reactions.
As a temporary workaround, you may follow these steps to disable macOS video reactions manually. The process must be performed by an individual with physical access to the equipment or 3rd party remote desktop-type software:
Zoom is working with Apple to provide a mechanism to control the macOS video reactions from the Zoom Rooms Controller and Zoom admin portal. This article will be updated as more information is made available by Apple.