Be sure you do this with a known setup. Very few USB cameras support more than one camera and then you need software to get it working. And yes you use a hub. But that's not the big hurdle.
What works better are IP network cameras.
I am planing to connect about 6 cameras through one or three usb 2.0 port.
Should I use an usb hub?
Lets say here are some info about images:
Size: 5200 x 3500
Depth of bit: 24 bits
Frame rate: 1 picture/second
All cameras are same.
Is there any problem with this?