Zooming in on a video clip post production

Or use the Program window by stretching the clip to the desired position

Any enlargement of the video will cause image degradation, only you can determine how much degradation is acceptable to you. Here is one way to do it:

Place the clip on the timeline.

Click on it to select it.

Go the Effect Controls Panel.

Make sure the Motion adjustments are visible by twirling open the disclosure triangle next the word Motion, the adjust the Scale. When you zoom in you may need adjust the Position controls (above the Scale control) as well.

MtD