Traditionally Skype for Business (and Lync) uses Remote Desktop Protocol (RDP) to screen share, this gives easy remote control but can be more bandwidth intensive than using a video codec.
Jeff has a great write up on it here: http://blog.schertz.name/2015/10/video-based-screen-sharing-in-skype-for-business/
It’s in Skype for Business Online now, and came to server in CU3, and now the mobile client support it too:
iOS
Android (thanks Shoulun Wang on twitter)
Yeah, apps like R-HUB HD video conferencing servers helps businesses and individuals in video based screen sharing.