Hello Vanessa,
I would also recommend what Julia is suggesting - Image of video and then direct them to the site - Youtube, Vimeo, etc.
Here is why it is most likely not supported in Cvent (yet).
There are a lot of different email clients out there and all treat videos in emails differently because of security reasons. For example, Gmail is the easiest if using Youtube (they own Youtube so no security issue here), but it would need to be on desktop and with Chrome. You just need to put the url link in the email and the video will display in the email if the personal Gmail settings allow.
However, there are a lot of others and depending on your audience it may be easier to just have a hyperlink on an image (of the video).
Email Clients that Plays Video (Must be HTML5)
- Apple Mail
- Thunderbird
- iOS 10, Native Client
- Samsung Galaxy, Native Client
Email clients that Won't Play Video (shows link / other)
- Lotus Notes
- Outlook 2003 - 2017
- iOS 9, Native Client
- iOS Gmail
- iOS Yahoo! Mail
- iOS Outlook
- Android 4, Native Client
- Android Gmail
- Android Yahoo! Mail
- AOL Mail
- Yahoo! Mail
- Outlook.com
If you do want to do some tests then you will need to make sure that your HTML sorts out what type of device is being used so the HTML can change accordingly.
@media
@supports
I hope this helps.