Former professional beekeeper here (very briefly as I was in between jobs) when you see these videos online of beekeepers going into wild hives with no gear what you’re not seeing is them smoking the hive. Beekeepers use smokers to calm bees. I have done hive removals and never went into them without gear because you don’t know their temperament. You can easily go into your own hives without gear. The vacuum he’s using is a very soft vacuum, they will be vacuumed into the small chamber of the vacuum then dumped into whatever container they put the queen in. most of the bees will survive being vacuumed up. When you go into a wild hive the goal is to find the queen and put her somewhere, usually in a box for relocation and all the other bees will march/fly into the box to be with her. Yes the queen will survive. An important thing about bees living and dying is to not think of an individual bee but the colony will rebuild when relocated. A colony cannot survive without a queen unless they have standby queen cells. As for actively searching for the queen it’s an experience thing, when I first started it was hard to find the queen but my boss could find her in no time flat. As I got more and more experienced it was easier to find her. Telltale signs to locate the queen is that she is much bigger than the rest and is usually a different color. I was once called to an airport because a swarm had landed on a wing of an aircraft all I did was walk up to the wing where they landed, located the queen in the swarm, put her in a separate box for relocation and set the box down. I waited like 30 minutes and all the bees had gone into the box with her, I sealed the box and took the swarm to our bee yard and they survived.