Zoom actually works fine under chromium on OpenBSD, with full microphone/webcam support. It just requires some configuration to enable a few things which are disabled by default for security reasons.

https://www.openbsd.org/faq/faq13.html#enablerec

https://www.openbsd.org/faq/faq13.html#webcam

https://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/www/chromium...