It appears that Swede is correct - your smoke unit is different than mine and looks like you need to remove the wheels in order to replace the smoke piston and lever.
However, from your video it looks like you should be able to remove the top half of the smoke unit by removing the one screw holding it to the frame. Once the screw is removed, you may be able to separate the top of the unit from the bottom by seeing if you can gently try to pry the top part of the cup up and away from the piston by hand or with a small screwdriver.
If the unit can be separated, you should then be able to manipulate the lever by hand and free it up or at least see what is making it stick.
