Don't know if you are used to continuous lightning, but you'd need way more power than in strobe config to acheive an equivalent lightning.
You'd also need space between the talents and the wall-background to "burn" it but not the talents-objects. (or height to lite from the top)
Take specially care that everyone on set is wearing shoe-protectors because it's way more painfull to erase dirt traces. Clone tools exist but it's no stills.
If it's not possible to lite the background uniformaly, the post-prod will recuperate the situation.
But then, you really need, when it comes to NLEs, to make sure that you have at least the capability to mask with beziers curves and track. Without going to do rotoscoping on Nuke,
no, but being able to color correct footage without those 2 elements (bezier+tracking) is prety much like having a car without the wheels.
You may want to look at Apple Color or DaVinci resolve lite (free).
Avid got those tools within the editor itself. There is a Mac version.
In the case mentionned (the video), it will be easy to recuperate a wall that wasn't lited idealy, but you'd need the apropriate tools, like chrominance etc...to isolate color-luminance-satu range in question and correct.
Without having to use a blue or green screen. (specialy with a 8 bits camera like the 5D2, greenscreens are painfull)
In fashion it's not appropriate unless the green screen is done by super pros and the post also, otherwise it'll be noticiable on the product itself and the post could become complicated (painting) and not for beginers range.
But if you'd had a white background with a white object, then you'd need to mask the object and track it.
When you shoot the 5D2, you'll need to convert the footage to a suitable format for editing/grading. I think that you'll be fine converting to Prores 4.2.2.
Here is a very good converter: http://rarevision.com/5dtorgb/
the idea is that you need to avoid like the plague the .264 or avchd formats.
The sensor cleaning of the camera is really important. No mess with that. Make sure your sensor is clean before each group of takes or at least one time at the beginning of the shooting day.
I forgot: if it's gona be fashion, the 5D2 is very prone to moiré. A GH2 is almost moiré-free.
Then you have to be carefull with the 8 bits devices when it comes to gradations, for ex a wall from white to greys. It posterizes easily and look frankly super crap. Not all 8bits cameras react the same, some models are more sensitive than others.
And of course if you're in Europe your shutter speed will be 1/50 yes or yes, otherwise 1/60.