Your Ic only supports 1A. Your camera need 2A.
You need something like this:http://www.nteinc.com/specs/1900to1999/pdf/nte1934.pdf
you will need to give it more than 5V to ensure proper regulation, this one has a minimum of 8, you might get by with 7.2V (6 1.2V rechargeable cells) but 7 would make it up to spec at 8.4V (wired in series). May need a heat sink on the ic. Theoretical 100% efficiency would give you 3360 mAh at 5V I think? or 1.68 hours of runtime if it actually pulls 2A@5V. so maybe an hour and a half realistically.
I only do hobby electronics, there are plenty of people here who know more than I do. Also, there are other sites that are dedicated sites for these things.
Be careful, it is easy to fry stuff when you make custom power supplies....