Man! Bumping your thread 3 times is not going to work! Try reading the ArmaHolic rules
Rule: [2.14] No 'bumping.'
Anyway, to answer your question .. Put the folder "gcam" in to your ArmA2 game directory! make sure that is
with the addons folder inside that, inside the addon folder you should have a file called "gcam.pbo" if that is correct
then your ready to go.
Put the this is your target line:
"C:\Program Files\Bohemia Interactive\ArmA 2\arma2.exe" -mod=@gcam
[Or to however your line should be, that above is to my game on the C drive! maybe yours is different.]
Now, ingame ... go in to the editor and make a unit, in his init line put this:
player addAction [ "GCam", "gcam.sqf" ]; player addAction [ "GCam Auto", "gcam_auto.sqf" ]; handle =  execVM "gcam.sqf"
YOU DO NEED the script in your mission folder for this to work!
That should be it... remember not to dump the thread anymore!