I did something similar to this before my surgery. I actually scheduled an email through @mailchimp for 90 days out to a select group of people. I figured if I wasn’t dead, I would at some point be on a computer and able to turn the scheduled e-mail off. Not quite as elaborate as a video, but I guess I could have just shot the video, password protected it, and then included the link and password in the email.
Still an OK idea for anyone wanting to leave some final complaints to their enemies. Though I’m not sure who I would choose as my three. I think some people would be too willing to confirm me dead to hear my final story even before my demise.