Waqas, The "Text on Camera" is called "teleprompter or Autocue" :)
We have used it in some of our tutorial recording in THINK UKAN Labs.
(Its very easy to make as a DIY project, by using a screen or a tablet + mirror reflection) :)
on Nov 13
hi;i'm begining to follow these courses of computer sciences,it id my first time to see this studio to diffuse all our courses,iwould like to present my thankfull for all the staff of CS50X GOOD LUCK BYE