VTOP AVC03M-C-U Ubuntu Version Analog USB Video Capture works with Ubuntu since Ubuntu 14.04 LTS and Newer. FFmpeg is required. For Ubuntu 14.04 LTS, FFmpeg is not officially included so you will need a specific PPA:
sudo add-apt-repository ppa:kirillshkrogalev/ffmpeg-next
sudo apt-get update && sudo apt-get install ffmpeg
For Ubuntu 15.04 and following versions, FFmpeg is officially included:
sudo apt-get install ffmpeg
After installing FFmpeg, install OBS Studio using:
sudo add-apt-repository ppa:obsproject/obs-studio
sudo apt-get update && sudo apt-get install obs-studio
More of the professional Instructions, please go to OBS Official Website's Installation Instructions.