To uninstall Ecamm Live's System Audio plugin, choose Uninstall System Audio... from the Ecamm Live menu at the top of the screen beside the  menu.

To uninstall Ecamm Live's Virtual Camera plugin, choose Uninstall Virtual Cam...  from the Outputs ➝ Virtual Cam menu at the top of the screen.
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To uninstall the Ecamm Live app, drag the Ecamm Live icon in your Applications folder to your Mac's trash.
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We do not recommend the use of third-party utilities to remove or clean up old files if you intend to continue using Ecamm Live in the future. This will ensure your preferences and data are not unintentionally erased.