This is a great idea, I'd love to do that too. But how would one actually go about this? Does he just film everything with a camera or his phone? He must spend

This is a great idea, I'd love to do that too. But how would one actually go about this? Does he just film everything with a camera or his phone? He must spend a lot of time manually going through all the footage to find the second that best represents that day. And surely he has to do this everyday too whilst all the memories are fresh in his mind so he can find the most important second? And then he manually strings them all into a video? Sounds like a lot of work (although the results certainly seem worth it). Or am I missing something here? How would you guys go about it?