The background can be blurred in three different ways, what they’re talking about here https://www.artlook.us/service/wedding-photo-booths-nyc/, combining them with each other or using only one, depending on the situation and shooting conditions.
Focal length and shooting distance
Distance between the model or object and the background
The methods are remarkable in that they are suitable for any lens and camera.
And blurring the background is achieved at the shooting stage.
This reduces the time for photo processing and enhances its artistic component.
Blurring the background wide open
I took this photo with a regular 18-55mm whale lens, combining close shooting distance and a slightly open aperture.
The background is 5 steps away.