Parent posted much of what I was going to say, so +1 from me
Tell her all about yourself. I am blessed to still have my father and mother around, but I still don't know enough about their lives. Make a mini-autobiography for her. Be detailed or stick to the highlights, whatever your style is. As you get this all out, you will also reveal who you are, and she will read and re-read it in years to come.
I encourage you to be open and honest about your mistakes. A lot of people want to cover them up and forget, take them to their grave. I was in my mid 40s before I really understood the problems my parents had faced... and how these were the same problems I was facing, and how much my actions were learned/inherited unconsciously from my dad. Learning this has been incredibly valuable to me, perhaps my most important life lesson ever. So share not just the good parts about you... share your pain, your failures, your hard won lessons. Love her enough not to hide from her.
For sensitive things, put them in letters and entrust them to your wife, to reveal at an appropriate time.
But spend time with her, all the time you can. Not on outings and vacations, but quality time. Talk. Interact. Hug her often. Laugh together. Get sleeping bags and have a slumber party with her, stay up talking and tickling and whispering - that is so much fun for kids, and so memorable. If you get the opportunity, sleep outdoors and count shooting stars. Spending quality time with your daughter is also one of the finest gifts you can give your wife.
Here's a thought: if you are going to make a video, do at least some of it with her, interactively. Put the whole family in the video. She will certainly have questions, and that gives you a chance to answer them, and gives your wife an opportunity to add perspective.
If you can, take some real pictures on old fashioned paper. They last forever, and can be taken anywhere. Digital formats do become obsolete, and media can be damaged.
Give thought to eternity and your soul, and consider that it may not only benefit you but be a comfort to your family.