re: videos

There are a couple of videos on the market that show some armed-citizen
tactics for building search. Clint Smith of Thunder Ranch has one video,
and there is one with Bill Wilson and Ken Hackathorn.
It's also covered in Gabe Suarez' book "Tactical Advantage".

However -- I have to wonder if you are asking the right question.

If you are in a building and you believe that there's a real intruder
that poses you serious harm, prowling around by yourself is the most
dangerous thing you can do.
If we're talking about home defense, a dog (or two or three), motion
activated lights, a baby monitor (to hear what's going on in the area
that an intruder is most likely to enter first) and cameras can provide
you information more safely than leaving a safe area just to go "hunting
for bad guys".

The #1 reason that an armed homeowner should leave a position of cover
(where a long gun can be used) and start moving around indoors is to
move to an unarmed family member or friend located somewhere else in the
building.
#2 reason to move is to get out of an area where there is a known threat
to get to a safer place (usually applies in public situations).

You can learn the concepts of how to "pie a corner" from a video or book
(sort of) but I haven't seen any book or video that covers the pros and
cons and applications of those techniques to realistic situations.
The only good source for that is in-person training, preferably that
includes force on force and not just live fire shoot house drills (where
the targets patiently stand there and wait for you, without attacking,
no matter how slow you go or how much noise and light you produce).

Karl