First, set up Compare Mode with two similarly recorded videos (i.e., same angle, distance). When you click the Overlay button, the videos will appear blended together as shown here:
It will still be possible to change each video’s position by using the sliders and the Key position buttons. You may also Step or use Slow motion on one or both videos.
The Slide tool in the Digital Effects frame may be used to fine-tune the alignment of your videos. Either side may be independently moved and zoomed.
NOTE: This feature is not available in demonstration mode. Also, when not in Compare Mode (that is, only a single video is open), the Overlay button performs the Live Video Overlay feature.