Spotting

The video is great. I think the best things to do in the future is to describe where you found them in the habitat section, and to get as many angles as possible for any type of organism to get you the best chance at a positive ID. Its a very cool observation though; I have never seen this behavior before

While watching them I noticed their abdomens were hairless. Unfortunately my pictures are a bit blurry when zooming in and they do appear fuzzy, but they weren't.
They also seemed small to me.
I wish I had taken more time to observe and document. I will strive to be better from now on.
Thanks for all your help and input!

I don't think it's Xylocopa violacea, but wouldn't the hairless abdomen mean that these are some sort of Carpenter Bee ForestDragon? Or is that a trick of the light in the video?

They might have just been busy chewing and not moving. Anyways, the habitat field is always helpful to fill out so others can learn more about the organisms in spottings :)

Thanks Machi!
This was taken inside Carter Caves State Park in Kentucky. Our campsite was surrounded by White Oaks, but I can't recall for certain that this was one of them.
Most were quite busy and didn't pay any attention to me. I watched them for a few minutes and noticed that some did not move at all, not sure if they were alive or not.

Great spotting and video! Can you describe the habitat? What kind of tree they were burrowing in, etc.?