Add volume control for the devices

[gtk2k]

Is it possible to set the volume?
I'm currently creating a page with a movie player, and when I'm viewing previews on multiple devices, everything sounds.
I checked if the volume can be set, but I could not find it.
If not, I hope to add a feature to set the volume in the future.

[manojVivek]

Sure @gtk2k, Will add it to the roadmap.