You did a great work spending time to create this informative video and I hope other members make good use of this. Some suggestions:

1) Those ranks and requirements shown there have very small font. Even with large YouTube window, it is difficult to read it. I  guess users will have harder time reading on the  smart phones as it will appear smaller. If you can make that font bigger it will be better. I am talking about font that appears at 0.18 and 0.56 in the video.

2) There are some small grammatical mistakes like at 1.05 it should be activity means "how frequently you post " .