Your post/story has struck a chord for me, and I'm now being a little selfish and thinking about how best to make a time capsule of knowledge and sharing for my kids, should I pass away (and my wife too, of course).
The first and obviously most important is how much you love her (them). Beyond that... I honestly think that if you just talk about yourself, what you think made you the person you are today, what helped or hindered that, what you dislike, etc... always with your best attempt at a 'Why?' answer following it up.
I think she is going to want to know who you are / were, and what made you into that -- more than anything else.
Then espouse upon your values and what tenets you hold dearest, again with an explanation. Do you believe it private or open-source software, and why?... as a top of the head example.
Then move on to snippets of tips and tricks, things you'd have taught your kid(s) as they grew and asked questions. It can be random, it can be silly, it can be incomplete -- it will all still be of value to her.
Don't constrain it to video either. If/when you feel that you're no longer representing yourself the way you want to in a visual format, move on to leaving textual information, notes, letters, tips, tricks. Build a wiki for her with random bits and bobs for her to discover that you think would be of use or interesting, both to you -- and her in the future.
And of course, leave a history of websites, accounts, passwords (probably in a password vault, with the password or keyfile stored elsewhere) of accounts/sites/memberships you held that you think she might find interesting. Giving her a window into your public and private history (using semi-private internet forums as a top of head example again) would likely be cathartic and interesting as well. Insights into who you were with people privately, away from the eyes of the internet -- or even the eyes of your friends or family. Not to mention the benefit of bequeathing said accounts to the next generation (though make sure the admin staff of such places are aware of the changeover, and make sure they're comfortable with it). Game communities, software communities, specific discussion communities or sites, etc.
I think the gist of it is, do your best to document for her Who you are and How you became that way, and let her follow the path herself as needed (ontop of / aside from the videos). She won't understand all of it, or perhaps even most of it, but at least you'll have done your best to give her all possible examples and avenues to explore at her own pace -- which I think would be cathartic in the long term, when she's in her 20's and becoming an adult, and missing her Dad in a different way than she will in the next few years.
I'm sorry for both yours and her loss, but thank you for posting this. It got me thinking about what I would do if I were you, which helps me start planning how to bequeath my knowledge posthumously, to my kid.