The video shows a casement window hinged left like a door. Judging by your handle it looks like you have an awning or hopper window. Your window is hinged most likely at the top or bottom, correct? If I am correct just by looking at the handle I know you can order replacement parts for that crank system instead of buying a whole new crank out system.
A very large US supplier of this type of window part would be CR Laurence. I buy stuff from their company frequently to repair windows. The part number for your handle is H3592 if I'm jumping to the right conclusions. You can find your handle and related crank parts on their site. I would take apart a functioning unit like nealtw suggested and determine what needs to be done. I bet you can do it yourself!