I totally get it as video is anathema to me too, but I think you're drawing exactly the wrong conclusion. YC doesn't care about any social commonplaces (personality, dress, etc.). They just want a sense of who you are as a potential founder. A lot of what might be considered 'negatives' in more conventional contexts aren't negative at all in the YC context, and might actually help an application.

p.s. YC is definitely not "all about personality" - I don't know where you got that idea, but the spectrum of YC founders is about as wide as you could get that way. There are extraverted outgoing types and introverted awkward types and pretty much everyone else too.