Hello, I'm totaly neewbie to realsense technology and propably this is why i'm asking such question
I'm looking possibility to detect certain item held by user and after positive verification I'd like to detect custom gestures made by this item. How can I achibe this goal?
Should I rather make app in Unity, Unreal, or perhaps it would be way easier in web app?
"Unity, Unreal, or web app" is just the display of the app. You can use any of them.
For actually creating the app, you would need some custom code. Have a look at PCL, VTK, or OpenCV for some starting points. Spoiler alert: it's not trivial at all to build your app.
Samontab i know that making apps isn't easy ;) i'm making soultions for building automatition for years. however I'm forced to make solution that required previously mentioned functionality.
Thank You for list of systems, I will check them first :)