There is a cable missing, or plugged into the wrong place it looks like. On the ESC there is likely a connector that accepts the motor signal wires, I think I see it but the video is too short and not pointing in the correct place for me to see enough. You only have the 5 volt and ground wires (the red and black) and you are missing something major that should connect the 2. Look close on the FC and ESC and you should see connectors that have either a 1, 2, 3, 4 or a S1, S2, S3, S4 on it (and probably a few other things) in the silk screening on the boards. If you can get very clear pictures of the top and bottom of the FC and ESC I may be able to point you in the right direction.