how to set zoom functonality in Trusty?

[Hammer Attila]

I forgot to wrote the magnifier support related check box possible 
awailable only if you using GNOME Shell.
For example if you installing gnome-session-flashback package and in 
Lightdm selecting the gnome flashback session, in GNOME Control Center 
Universal Access preference pane the magnifier related checkbox not 
available too.

Attila