Hmm, we'll see about the intro.
I have watched the entire vid, but not very much in detail and focus.
The two tips I already have for you are simple. The first one is to try to be more aware of what your position is on the map. For example on 02:11 you run back to try to snipe a dude, but when you do you expose your entire back to the flank you were just covering. This gives the other team the option to kill you. Instead you can take a step or two forward, to put a wall in between yourself and that flank.
The second tip I have is to increase your mouse sensitivity, I notice you having a slowmo mouse drag, also when zoomed in. COD is a very fast paced game, try to get used to playing a bit more twitchy. At the start it will be hard, but once you get used to playing with high sens in COD, you will improve tenfold!