@JeffersonRSM: Hi, thank you! This guide is solely aimed at and compatible with Kinect V2. It is possible to control gestures in Kinect v1, but you need the respective SDK and Plugin. Have a look at the following pages:
You might have to play around with the values though.
As for audio cue:
You can put a collider around the object that is moved / scaled by the hand as well as the other object. If you don't want them to actually stop each other, it is possible to mark one of them (! never both) as trigger, which changes the methods a little. Also give them a tag that helps you identifying the correct collision before executing any actions.
Anyway, you need to attach a script to one of the objects. In that you will call either OnTriggerEnter or OnCollisionEnter
@Bronsdijk:It's pretty useful if you, for example, already have a BizSpark allowance and run your devblog locally :) Pure MySQL-Service subscriptions aren't necessarily cheap externally either - so in this constellation it might be even a way of saving costs for the time being.
I don't claim that this is or should be a silver bullet :)