There is at least one app out there called Snap Camera that will let you turn yourself into a variety of on-camera creatures. While it doesn’t provide the exact cat head the lawyer found himself wearing, it does let you add a wide range of effects, backgrounds, and distortions, some of which are downright nightmarish.
https://www.theverge.com/22276091/zoom-snap-camera-filter-how-to-youtube-cat