Reddit reviews Magic Makers Magician's Wax and Invisible Thread - Easy to Use and Easy to Remove - Ideal for Anchoring in Levitation Tricks, Marking Cards and Vanishes

Basically using this

Invisible Thread and Wax Kit - Magic Makers https://www.amazon.co.uk/dp/B002FP9L1W/ref=cm_sw_r_cp_api_i_l5TTDbQZHTWGR

Something like this: https://www.amazon.com/Magic-Makers-Magicians-Invisible-Thread/dp/B002FP9L1W

Actually what's more likely and easy is that the cameraman is using invisible thread that's stuck to the 8 ball with a tiny bit of wax. Invisible thread is what magicians use to levitate things. The camera shakes because it's the cameraman who pulls the thread, causing the 8 ball to roll towards him.

It's this stuff. Attach one end to yourself (in my day, I used a fake pager that contained a spool of the thread), and the other end to some object using magician's wax. Looks to me like he might have two lines going for the napkin to be so steady. Probably has one end fed through a shirt button hole, and the other stuck on a chair at the other end of the table. Some really fun wizardry can happen if you're wearing black, or if the background is black. People can get right up close to the effect, and never see the thread. It's really that thin.

https://www.amazon.com/Magic-Makers-Magicians-Invisible-Thread/dp/B002FP9L1W/ref=sr_1_1?ie=UTF8&qid=1479303881&sr=8-1&keywords=magic+thread

Not even kevlar. I have a bunch of the stuff actually. You can pick it up in most places that sale magicians stuff. Usually comes as a long piece of what looks like a thicker piece of cotton thread and you separate your own piece of thin fiber from the thicker part, so that one string has like 50 super thin pieces you can use. It's a bit elastic.

Tie one end to your back belt loop and drape it right over your head in front of you and you can make the stuff float in pretty neat looking ways.

$4.00 Shipped

Not actually a wire, but super thin nylon strand with a bit of sticky on the end.

You can buy it at any little magic shop or Amazon for about $6.00: https://www.amazon.com/Magic-Makers-Magicians-Invisible-Thread/dp/B002FP9L1W/ref=sr_1_1?ie=UTF8&qid=1526315145&sr=8-1&keywords=floating+card+trick

There is a string that goes over her shoulder or head. Its magician string. She grabs it as it comes around and hold it up with her fingers. http://www.amazon.com/Magic-Makers-Magicians-Invisible-Thread/dp/B002FP9L1W

https://www.amazon.com/Magic-Makers-Magicians-Invisible-Thread/dp/B002FP9L1W

I'm thinking less dexterity and more invisible string

http://www.amazon.com/Magic-Makers-Magicians-Invisible-Thread/dp/B002FP9L1W

I think she's using some of that super thin/fine magician "invisible" string... and it looks like it could be taped to her forehead. Watch from the 1:13 mark, and play the YouTube video at 0.25 speed.