Controlling volume with touchscreen

[cq0q]

Hi everyone, I need your help with this …
I just found someone from youtube that managed to control the volume with touchscreen and it shows the cursor is a really beautiful way:
https://www.youtube.com/watch?v=sh2EJzplkpM

I really wonder how he did that but he didn’t say … anyone could know how he controlled the volume like this and how to do the same with the brightness ?
Please let me know if anyone could manage/managed it already.
Thank you so much !

[sdetweil]

@cq0q never looked for this before, but it looks like a standard web interface

https://developer.mozilla.org/en-US/docs/Web/API/Touch_events/Multi-touch_interaction

might have to have a transparent fullscreen_above module to overlay everything