2D Tracking - Nuke 101: Professional Compositing and Visual Effects - page 238

9. Bring the Multiply value back to 1.
Now with motion blur added, you can view your final composite in Framecycler
(or the Viewer).
10. Select Merge1 and press Alt/Option-F to view the final output in Framecycler.
11. When the render finishes click Play and have a look ( FIGURE 5.36 ).
Figure 5.36. This is what the final result should look like.