You can change to rechargeable batteries but don't expect a set of rechargeable to last as long or work as well as non rechargeable batteries.
Your trail cam uses 8x AA batteries - that's 12 volts when using non rechargeable batteries and only 9.6 volts when using rechargeable batteries.
Also, good quality non rechargeable batteries have higher capacities than even the best rechargeable batteries
The trail cam will have some minimum voltage below which it will not work - probably somewhere between 8-9 volts
The combination of lower voltage and lower capacity with rechargeable batteries will significantly reduce the length of time for which the trail cam will operate correctly.
Also, if you use rechargeables you'll need chargers - probably one for each trail cam
I'd be buying bulk Duracells like this
Industrial Procell AA LR6 Professional Block Alkaline 1.5V Batteries - 100 PACK | eBay
Let's crunch the numbers
A pack of 8 Panasonic Eneloop rechargeable AA batteries costs £28
PANASONIC ENELOOP RECHARGEABLE BATTERIES AA AAA PRE-CHARGED 950 2500 1900mAh UK | eBay
An 8 slot charger cost about £10
So, for 15 trail cams, your outlay to run them on rechargeables will be about £570
120 Procell duracell non rechargeables will cost £41.50
So, you can fill all the trail cams about 14 times with non rechargeables before it becomes cheaper to use rechargeables - and each fill with non rechargeables will last significantly longer than a fill using rechargeeables.
it comes down to how long your project is likely to last
Cheers
Bruce