Andy’s Elastic Aspect is a free plugin to dynamically stretch the aspect of mismatched footage to fit a standard 16:9 frame.
Download Free Plugin
If you are already running a recent version of FxFactory, you can skip to step 2:
You can install FxFactory by double-clicking the installer once the download is complete.
Install Elastic Aspect by double-clicking the downloaded file. The product will appear inside FxFactory, as well as Final Cut Pro, Premiere Pro, After Effects and Motion.