I haven't seen anything from today but it sounds like they are meaning something like they have chosen a wicket (pitch) to play on but have then changed it for some reason e.g. they felt it wasn't going to help the spin bowlers etc.. As far as I am aware once a wicket has been selected it can't be changed.
The looping CCTV means that rather than taking continual fresh pictures, it has been setup to loop so that the same picture is shown on the TV where as in fact there are people out on the pitch doing things that won't be recorded on the CCTV (a bit like what they did on the film Speed when they were getting people off the bus)
I hope that helps.....if it's nothing like that at all I apologise now!