So one important point about Lightning Arresters: they do nothing to protect cameras, or whichever other devices they are connected inline outside a building. If lightning strikes your camera, it is toast. A lightning arrester primarily works to limit the harm of a lightning strike to only the camera.
It is kind of like a surge protector in reverse.
#1) "cable shield grounding be enough against lightning strikes to protect camera"
In general, no. Shielding is different than grounding, but there is really nothing that protects a camera from lightning. You can employ lightning rods (or some other more attractive conductor) that lightning may strike in lieu of cameras, but if lightning strikes your camera it almost certainly is a casualty.
#2) "Can we connect earth point of lightning arrester to cable shield grounding ?"
Again, shielding is different than grounding, but if we're discussing grounding like the article above mentions then yes, lightning arresters can be (and should be) connected to those points.
#3) "can the grounding cable from lightning arrester be placed along camera data cable and go to earth point of the building or does lightning arrester have to be earthed to the pole earth point (if exists) ?"
In general, the sooner you can ground a lightning arrestor, the better! I think either way you describe would work, but it sounds like physical distance to a ground point would be shorter at the pole.
Anytime a conductor carries hundreds of thousands to millions of volts (ie: a lightning strike) there is a high likelihood it will be obliterated in the process. Shorter ground paths = better because of less damage.