I use Fedora 23 ARM on a Raspberry Pi 2, with Xfce as a desktop environment. I want to install RealVNC. Can you help me ?
For most use, you could use TigerVNC, which is open source and available in Fedora.
The "experimental direct capture" RealVNC feature you want, however, is only included in the proprietary RealVNC software. There is a download available, but for ARM only for Debian currently. (See https://www.realvnc.com/download/vnc/raspberrypi/). They make RPMs, but only for x86. You might have success in asking RealVNC nicely to make a Fedora version.
Or, you could download the .deb and convert to rpm using alien. (I don't know how this fits with their licensing terms, so, mind that.)