Once you have the timeline set up (#50) and the matte created (#51), it's time to apply the Track Matte Key and complete the highlight effect. Here's how.
Troubleshooting
This technique is binary; if you've got everything set up correctly, it should work; if not, it won't. If you're using a Premiere Pro title as the matte, the most common mistake is forgetting to save the file as a Closed Bezier (see #51). If you're working with a matte you imported from Photoshop, check to make sure that you saved the file as a grayscale image and left the background transparent.
1.
Drag the new title to Video 3 directly above the two other clips.
2.
Apply the Track Matte Key (Video Effects > Keying folder) to the top video clip (Video 2 in the example), not the new matte.
3.
Select the clip on Video 2, and open the Effect Controls panel.
4.
In the Track Matte Key controls, click the Matte: drop-down menu and choose the track containing the matte. In this example, it's Video 3 (Figure 52).
Figure 52. Once you choose the track containing your matte, Premiere Pro should apply the effect, showing the result in the Program Monitor.
Applying a Blur or Mosaic Filter
Let's say you want to blur out the face of someone on the video. How would you do it? Use the same procedures described in the last three techniques, and apply a blur or mosaic video to the video on Video 2. The matte will limit its application to the defined region, blurring the face and showing the rest of the video in full detail.
5.
Leave all other controls at their default settings. You should see the video from Video 2 (in the example, full-color video) showing through the matte, with video from Video 1 (in the example, the darkened video) elsewhere in the frame.