I don't think a OM video exist. Not to worry a OM is easy, way easier than a NM in my opinion.
Assuming you know how to catch the strut assembly and have pulled the Grip Frame without loosing the Pawl spring/ plunger assembly. (Just like a NM)
1. Pull the trigger screw & trigger.
2 . Unload the bolt spring, with a small screw driver. It's hooked in the side of the cylinder frame, push it down a little and when the little leg clears move it away from the cylinder frame wall, unloading it. Remember how you did this because you will want to assemble this and then reload the spring, DON'T get in a hurry and load it untill you have it captured/ secured by the thru screw. (It will go fly away baby, and you will look like this little dude... :shock: )
3. Now pull the bolt screw, bolt & bolt spring.
4. Hammer screw, Hammer & Pawl.
Your done it's really quite simple and easy. No captured pins like the NM.
Just remember to unload and load the bolt spring when you have it captured ONLY. Don't have too, but you will run the risk of loosing it.