linux – Restricting OpenVPN connection to only one program

My Linux server works with YouTube videos a lot, downloading and collecting data about them with the help of youtube-dl.

I want to route this program (youtube-dl) through an OpenVPN connection. Seems simple enough, except I need only youtube-dl to use the VPN connection, as I also run a web server among other things which cannot use the VPN connection.

How can I configure my server to only use the OpenVPN connection for youtube-dl?