Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Editing › Incorporating 4:3 Stanadard Definition Footage Into Resume Reel › You could use a background
You could use a background color/graphic/motion and overlay your clips in 4:3. Use text and titling to tell the story. Post a disclaimer up front about source of video and specs of equipment used.
If you send prospective employers to YouTube, consider a new channel with just your ResumeReel listed in case you don’t want them to view all of your videos.