The video looks correct to me.
Here is a film with narration demonstrating a power on stall tork roll. The slowest the plane gets in this film is 41 mph but one could hold it a bit longer if you could time the rudder and roll correctly. If you bring it to near 0 the plane will tail slide, which is sometimes useful but not a controlled reversal.
You can do it with or without flaps. If you go into it with flaps out it helps to reel them in before you roll. The flaps will make hit harder to push the nose down and make the plane mush into the move. With flaps off at the time of stall the plane will come nose down faster. After the nose drop re deploy flaps if you have to...like to go into a flat turn and keep alt.
power on stallYou might find this topic helpful
http://bbs.hitechcreations.com/smf/index.php/topic,285774.15.htmlGrizz is better at this move than I am. He probably has film of him doing it. Mabey he will post.