You've just finished filming and editing your video only to find that someone doesn't want their face shown to the whole world. Or perhaps that practical joke that seemed hilarious to your and your friends is just slightly too "adult" in its present form. What you need is a way to censor a part of the video. So let's get started on pixelating that offending piece of video!
The first task is to create a guide for the area we need to censor. So with Adobe Premiere Pro open, and the timeline marker on the relevant section of video on the timeline, select File > Export > Frame (or hit ctrl-shift-M) as per figure one to the left. Select a name and location for your bitmap image and press save.
Next goto your image editor and open up the saved image. We're going to draw a free hand selection of our area, although you could easily use a preset shape. For this guide I am using PaintShop Pro, but any image editor will do the trick.
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You should now have a region of your image selected as below:
We now need to create an alpha channel out of this selection, so select Selections > Save to Alpha Channel in Paintshop Pro. (In Photoshop this is select > save selection). We need to save our image so that newly created alpha channel is preserved, so lets save as a photoshop image file (with a .psd extension). We can then open this up in Adobe Premiere to use as a track matte.
Once saved, import your new photoshop file into Adobe Premiere Pro (File > Import in ). Still in Adobe Premiere, we now need to create a section of black video which will become our censor overlay. Select File > New> Black Video.
This video should appear in your project window. Drag this black video and place it above the track with your video in the timeline. Now drag your imported photoshop image and place it above your black video. Your timeline should look something like the image on the right. Note that the "eyes" to the far left of the timeline should be exactly as the image. Note that the eyes to the left must be as the image - as the photoshop image is to be used as a guide only, it is not to be seen, so simply click on the eye to make the track hidden.
The next step is to make a track matte. Go to the effects tab and browse down to the keying folder and select Track Matte Key. Drag this and drop on the black video in video track 2 in Adobe Premiere Pro. Now go to the noise effect under Stylize in the effects tab of the project windows and again drag this onto your black video. Now click on the black video in your timeline, then go to the effects control tab and change the following settings as per the image below:
Set the Matte to video 3, noise to 100% and untick noise type anc clipping:
You should now have a video as below:
You can combine this effect with the motion settings should you need to move the censored area around. See the guide to Adobe Premiere Pro 1.5 for more information.
You can combine this effect with the motion settings should you need to move the censored area around. See the guide to Adobe Premiere Pro 1.5 for more information. 
