Hi! This guide aims to remove completely NDI from macOS. If there is a missing or a mistake please inform me.
Open NDI Virtual Input and instead of clicking 'Install Camera Extension', start by uninstalling the existing Camera Extensions:
Remove the file located at: "/Applications/NDI Virtual Input.app"
Remove the file located at: "/Library/CoreMediaIO/Plug-Ins/DAL/NDIVirtualCamera.plugin"
Remove the file located at: "/Library/Audio/Plug-Ins/HAL/NDIAudio.driver"
Remove the file located at: "/Library/PreferencePanes/NDI Output.prefPane"
After your device restarts, verify your input and output devices to confirm that NDI has been completely removed.