If you’re using Perspective, you actually have support for whatever streams the browser supports.
H.264 and WebM should both have good support in most browsers. I’d use one of those streams. Most webcams at least provide an H.264 stream these days.
https://docs.inductiveautomation.com/display/DOC80/Perspective+-+Video+Player
RTSP is a completely non-web protocol, so if you need to connect with one of those streams, using Phil’s module or a separate converter is still the way to go.