not likely, most common devices that require the extra power are: PTZ's and High Powered Access Points.
iirc its like 15.5W for normal PoE, 25W for PoE+.. fixed cameras, even with alot of IR max out ~10W, most run 4W-8W on average.
maybe if you were planing on using a few high powered IR illuminators over 15W and run them off PoE.
most popular cameras here that need PoE+
Huisun Bullet PTZ = 18W
Dahua Black Face PTZ = 24W