Need to do this but I don't know what it's called

Help/How To
4

This can all be done with Crop: Rectangle & Keyframes.

In my example, I used 2 tracks for ease of demonstration. The blue would be your black bars.
Example video:

Here is the MLT project file so you can see what the settings are.
croprex.mlt (4.6 KB)

If you need to zoom in while cropped, as @RilosVideos has stated, use the Size, Position @ Rotate filter. You will need to use Keyframes with this filter as well.

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