this could be done. but not very well with the software you probably have in mind.
the recordings you would need would have to be top quality. (so no audience recorded boots for a start)
then there is the issue with the bands timings... which can be altered very easily, but it is a serious ball ache, which takes alot of time.
it is possible to seperate certain tracks, like filtering vocals out of the tracks... drums also... but when it comes to seperating guitars (rhythm from lead) that will be harder as they are the same frequencies.
but even then, someone without the experience of such things is always going to have spill from other instruments in their seperate tracks. so it will sound like a mess.
in my opinion... it wasnt even worth me writing this, as im basically just saying, there is no point what so ever.
make some DVD artwork or something