1. Import Your Video Footage
After launching Wondershare Filmii on your Windows computer (a Windows 10 PC is used here for reference), click Start from Scratch, click Import File, and import a video footage that you want to zoom in from your local computer to the program. Next, hover mouse over the imported clip in the Media window, and click the + button that comes up at the bottom-right corner of the thumbnail to add the video to the Timeline at the bottom.
2. Apply the Zoom Effect
Select the media track in the Timeline, position the Playhead (Skimmer) to the frame you want to start the zoom effect from, and click the Split button from the toolbar above the Timeline itself. Likewise, position the Skimmer to the frame you want to end the zoom effect at, and split the clip again. Now, select the segment you isolated, and click the Crop and Zoom button from the right toolbar above the Timeline. On the Crop / Pan & Zoom window, go to the Pan & Zoom tab, and drag the side handles and reposition the frame to the area of interest as needed. Optionally you can also choose your preferred aspect ratio from the Screen Size drop-down list. Selecting Custom enables you to enter custom values as required. Once you are done, click OK to save the changes and to get back to the main window.
Note: If you ever mess up the settings, you can always click the Reset button on the Crop / Pan & Zoom window, and start all over again from the scratch.
3. Save Your Video Clip
On the main window, click the Play button from the Preview window to review the expected output. Once everything looks acceptable, click Export from the top, and follow the on-screen instructions to export the video to your preferred format.