However, I did it slightly different from how it was described as I didn't want to go installing third-party packages willy-nilly or by accident. I could have just installed kazam and then removed (or commented out) the CrunchBang repository, but then it wouldn't get updates. So what I did was to use apt-pinning to tell the package manager that I don't want any CrunchBang packages installed unless I explicitly install them (or they are pulled in as dependencies of something I explicitly install).
To do this, I first added:
deb http://packages.crunchbang.org/waldorf waldorf main
to my /etc/apt/sources.list with a comment to explain what it is doing there. Next, I added the CrunchBang key with:
wget -O - http://packages.crunchbang.org/statler-dev/crunchbang.key | sudo apt-key add -
Now, to set my preferences, I created /etc/apt/preferences like so:
Pin: release n=wheezy
Pin: release n=waldorf
Setting Pin-Priority less than zero is what indicates I don't want packages installed from this repository unless specifically requested. Note that this also means that it will not be upgraded by the usual commands, you must use the command you originally used to install it, but it will be possible to upgrade it with a single command without updating any configuration files again.
Now, I update the package list and explicitly install kazam from CrunchBang Waldorf (Waldorf is the CrunchBang release corresponding to Debian Wheezy):
aptitude -t waldorf install kazam
Now you should have Kazam available to record your own screencasts. All of the options are right there when you open it, to select video and audio sources, codec (VP8/WebM or H264/MP4), framerate, use a countdown timer, capture the mouse (or not), or select a region of the screen to record.
Kazam on Debian (KDE 4)
Note that all of the above commands (including editing files) need to be done as root, except for wget. Also, the line starting with wget uses sudo to run the apt-key command, so you need to be in the sudo group or else run the whole thing as root without using sudo.