if you are just recording from wifi cameras it is normally ok , as any short hicccups with the 802.11 connection are not noticed because the camera has a small amount of buffer and when you view the recording later it is normally ok.

if you are watching them live , you will see them stutter regularly , and if you watch a trend of the data it will be all over the place like a mad woman shitting.

with so much using the 2.4 GHz section , it is just better to run a LAN if you can - imagine living next door to butterfly and having his bluetooth remote buttplug continually interfereing with your wifi