Move the playhead to 2 seconds, and drag the slider to. This adds a red diamond for Width where your playhead is. To animate Width and Height, right-click on Width and click Animate. Drag the plus sign beside Height to Width to link them together. Right-click on Height, and click Expression. Adjust the Width and Height with one slider. Let’s say you wanted to link height to width. DaVinci Resolve has expressions similar to Adobe After Effects. To animate the mask on, you can use a simple expression to save time. To only modify a mask, switch to the Modify Only tool. Clicking on the mask with this tool will modify an existing point or add a new one. Once the mask is closed, Fusion switches you the Insert and Modify tool. Select the first drawing tool (Click Append) and draw a box, making sure to close the mask (a circle will appear when the mask is closed), and you now will have a white mask on black. Select Polygon1 or B-Spline1, and press the 1 key to load into the left viewer. You will need to draw a mask first when using these two tools. Apply a Polygon or B-Spline mask to MediaIn, and the video will disappear. The Filter drop-down gives you a variety of blur qualities that you can apply when adjusting the Soft Edge and Border Width. 
Modify the mask settings in the Inspector to taste. If you were to export this clip with an alpha channel, the checkboard area would be transparent. A mask is applied, and the checkboard shows transparency. 
Click on MediaIn1 and select the Rectangle or Ellipse Mask from the toolbar.
On the Fusion page, you have a MediaIn node and MediaOut node. We’ll show you how to create a mask using this fire clip. 
With the types of masks outlined, let’s take a look at an example. To learn more about the other effects available in DaVinci Resolve, check out this tutorial here. These and all the other masks are available from Effects Library > Tools > Masks. Drawing shapes comes more into play when tracking masks to follow the video and when rotoscoping (separating a foreground element from the background). The first two are basic shapes, and the last two you can use to draw a shape. Four of the most used masks are available in the toolbar: Rectangle, Ellipse, Polygon, and B-Spline. The Fusion page in Davinci Resolve offers a variety of masks to choose from.
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