Question Using breath to initiate a animation

Saw some meditation apps, and I'd like to figure out how to use a person's breath to create and control an animation in front of them. For example, images and leaves move and blow away as they breathe out and blow towards them when they breathe in. Really want to try this; where do I start!?

 

I did find this.. https://www.speed-tutor.com/blogs/news/cold-breath-particle-tutorial-unity-particle-effects

Will see if it helps, seems CLOSE but not exactly what I'm thinking about.

 

Maybe there are training bands on the market to put around the stomach to track the diaphragmatic breathing in yoga?

 

Human Breath Detection using a Microphone
avalur (rug.nl)

 

nope