Those answers will be calculated to sound the way you want to hear. "Of course I enjoy working, if I can't get 90 hours of work in, I feel depressed that I'm not living up to my potential...taking days off is also completely unacceptable, since I don't want to let my coworkers down."
And getting a feel for a person from a video is not too smart either. In one case, you are friends with the person just talking. In another they are trying to essentially beg for a job talking into a camera, alone in a room.
And if you are getting 1000 applications, it's completely dishonest to require all those people to spend days creating their applications. You are not going to watch 8000 hours worth of video and read all those essays...so why do you require people to do busy work?
And if you are going get 1000 applications, you won't be picking non-programmers either(well maybe one). So why get all those people's hopes up and waste their time? There is no way I'd believe you'd pick someone with a biology degree over someone who already has the basic programming knowledge, where you don't have to explain what an IF statement is or how to create a variable.