Your video is very hard to follow. All I saw was a extruder controlled manually just jittering from having no second coil powered or not enough power to turn. Are you sure motors are connected correctly? If you have normal speeds and steps per mm you should see smooth moves, which I do not see so that seems to be the root problem at first glance.
There are 2 ways to connect the 4 motor cables but only one is correct and will work. Check driver documentation how to wire them correctly.