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Highlight and conceal
This tool will help you control the focus in a frame, blur or darken parts of a video and track objects in motion.
Applying a mask on your video
1. On the Timeline, select the clip that you want to edit.
2. Click the More Tools icon on the left-hand sidebar and select Highlight and Conceal under Video Editing.
3. Choose a mask from the list.
4. In the Mask Properties tab, select advanced settings.
5. Click Apply to save the changes.
6. In the player, move the frame over the object you want to highlight or hide.
7. To change the size and shape of the mask, drag any of its corners in the player. Click anywhere inside it to move it.
If you want to cover up or highlight more than one object, click Add mask at the top of the Highlight and Conceal panel to create another mask. To delete the mask, click the trash icon. 
Motion tracking
1. To link the mask to an object in the video, go to the Motion tab.
2. Select the tracking method. Quick is suitable for static objects, Precise is suitable for moving objects.
3. To track the object and link the mask to it in the video, click Track.
4. To reset the tracking, click Reset.
