Can a DSLR be used to host a webinar? Can a DSLR be used to stream a web conference / webinar? In my exact case I have a Canon 70D available.

Is this possible and how would I get started setting it up?
FYI the Canon 70D can't record for more than 29 minutes, 59 seconds at a time. If you're just streaming, look into the BlackMagic Web Presenter. It can trick your computer into thinking that any HDMI or SDI source is a webcam.