Step 5: Stacking webcam pictures, introduction
I used the free Avi Stack for stacking (you can also use the also free Registax), which works on Windows, Mac and Linux. You can capture the video with your webcam's software, but I found that it's better to use wxAstroCapture, available for Windows and Linux, as my webcam software wanted to produce .mpg files, and then I had to convert them to .avi files with Windows Movie Maker.
So, install Avi Stack (on Windows, you just unzip it into any directory where you want it) and and any video capture software you need. You need to make sure your capture software produces videos in a format Avi Stack can understand. See Section 2.3 of the Avi Stack manual for supported formats. On Windows, I strongly recommend you follow the instructions in Section 2.3 to install support for additional Windows .avi codecs: go here, and download the krsgravi.zip file by unzipping its contents into the directory where Avi Stack got installed.
Once you have all this installed, capture a small .avi segment of your sample with your webcam. Don't worry if there is noise jumping around. Here's an example.