Drag and drop the video on timeline. Play the video to check it.
Split the clip where you want to zoom in.
Again split the clip at position till you want the zoom effect to last.
Right click on video on timeline tools – pan and zoom.
Drag and drop zoom in effect on clip.
In preview window drag the zoom box to the position where you want to zoom in.
Drag the zoominout tool’s point to zoom in more.
Same way you can add zoom out effect.