can video/audio or other multimedia streaming work without an SSL certificate

I have an app which I have uploaded on the web now It is an E-learning application which requires video/audio or other multimedia streaming features e.g. It will have video chat and virtual classroom feature.

Now the thing is that I have heard from, someone, that If I don't have an SSL certificate on my website I won't be able to stream data online such as voice calls, virtual classroom, audio streams, etc.