Atendees can submit a question (a message will appear that within 24 hours you will get the answer) and the org. will receive it in a csv format, so He can only reply by email. So it is not a live Q&A.
You could host a regular webinar and just play a video. That way you have live discussion via text in the Question box during the webinar, and can even have a live (with microphones) Q&A before and after the video.
Chris Droessler are you suggesting the Share Video option available within a standard webinar? Those that dial-in by phone for the webinar will not be able to hear the video's audio with that method will they?
Yes, that is correct. I rarely have phone-in Attendees.
Another option is to use a second computer to play the video and use something like the ATEM Mini to send the second computer's output to the webcam input of the main computer. This works only if there is spoken content, GoTo will make music will sound bad. Also this crops the edge of the video, but you can insert the video into a PowerPoint slide on the second computer and shrink the video size a little to avoid the cropping. All of this has been discussed in these discussions.