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There are a multitude of ways to do this, from the fully automated (mokey) to completely manual (paint through to the clean plate with something like combustion).
In really simple terms...
Typically the first step would be to create a 'clean plate' i.e. reconstruct the background that the character you want to remove is standing in front of.
You would then use the tracker (in the software of your choice, combustion, shake etc.) to track the clean plate to the background.
You then roto out (create a mask for) the character that you want to remove. tracking tools can be helpful here again.
Then basically you use the 'mask' that covers the character to allow the background from the clean plate to show through.
Making it seamless is a whole 'nother issue, but that is pretty much how it works.
You then have to be careful that you don't end up with a predator effect, i.e. that you have a ghostly version of your character because of slight differences in the background plate vs the live action (like film grain etc.).
Look for online tutorials for your software of choice - a good way to do this is to google "softwarename wire removal tutorial" or "softwarename rig removal tutorial"
e.g. just type this into google:
shake wire removal tutorial
and you end up with a bunch of tutes for shake.