When doing a Screen Capture in Canvas Studio, the option to record from a webcam in addition to recording the screen isn't working. I've tried it on 2 different Macs running macOS Catalina (10.15) in Google Chrome and Safari with the same symptoms.
I know Catalina changes a lot of behavior surrounding how applications have access to things like the Mac's camera, microphone, file system, etc. but I've verified that the Screen Recorder.app already has permission for Screen Recording and Camera in System Preferences > Security & Privacy > Privacy.
I have no problem recording a Webcam Capture in Canvas Studio so I know my webcam is working properly and has the appropriate permissions to access my Mac's camera.
I contacted Canvas support about this and they've identified it as a known issue that they were able to reproduce. Canvas case 04887797.