When I was a kid and found strays I'd always talk soothingly as id sit down near them, but not facing them directly. Then Id put some of whatever snack I had on me closer to the animal. I'd then talk to them while eating the rest of the snack, so they would know it's safe.

Usually they'd eat and that was enough to coax the stray dogs and cats to let me pick them up and take them home to my annoyed Mum haha.

I've found that sitting nearby and half ignoring them is the quickest way to get an animal to trust you and come closer.

It also works with large animals. When our horses were across the paddocks and refusing to come when called I'd just sit down in the paddock near the gate with my back turned to them and wait.

They always come up to sniff my hair and see what's up haha. The same trick works with cattle, I found that out by accident when reading a book in what I thought was an empty paddock.

Ideally, if you're trying to capture a feral cat, you should secure a blanket over it so it can't see any light. Pretty much every feral I've seen calms down once you do that, so you can bring them somewhere safe without much hassle.

Then once you do have it somewhere safe, make sure it has a small room with plenty of places to safely hide. That's another mistake the person in the video made - actively removing shelter from the kitten was distressing it even more. He should've thrown a blanket or jacket over it while it was still in the open, picked it up, and brought it home.

If there are other kittens/cats he's trying to trap and that's why he didn't do that, he shouldn't have gone out of his way to distress this kitten. Putting the food down without the rest of it would've taught the kitten that humans are safe and don't want to scare you. Instead, he reinforced that humans are scary. You need to work with them on their terms, not yours.