"To" doesn't work for me.
Interested in Language
In the same video, the severed head of US hostage Abdul-Rahman Kassig was displayed for the camera.
If i'm using the word "to" instead of "for" in above sentence. What does the sentence mean? Is it the meaning as same?
I think "for" was used on purpose to suggest that the severed head was displayed prominently in order to ensure that the cameras got a good shot, to ensure maximum publicity. It was, of course, shown to the camera but I think the point is that it was done "for the cameras" - the phrase suggests that a very particular point is being made or that someone is doing something specifically because they know they are being filmed.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.