I just joined the forum specifically to reply to this thread. I would also like to see basic iframes support in Bear, the way it is handled in Obsidian and other similar markdown editors.
The purpose of embedding a video would be to do note taking directly in Bear while viewing it, so full screening them to a browser would defeat that purpose.
An additional feature which would be also very useful would be the option of having time tagged notes, as Yinote for Chrome does. This would make it an incredibly powerful annotation and reference tool.
Thank you for your consideration!