Welcome to the forum.
Let's go back a bit. Did you set the camera to film in Widescreen, 16:9 w/ PAR = 1.2 (for NTSC)?
If so, did you start your New Project as a Widescreen Project and then Capture from your camera? If not, please list your settings and your exact steps.
Now, what were your Export/Share settings?
Also, QT Player has some issues with Standard vs Widescreen material. Have you looked into forcing QT Player to display Widescreen?
My camera is a consumer camcorder. I only have the option of full screen or wide screen video shooting. I'm not sure as to which wide screen setting I need to choose when I set the file up initially, but I tried them all (to the best of my knowledge). I didn't capture it from the camera, I used the sd card to upload the video files to the computer.
Export settings, 1280*720, 29.97 fps, prgressive 24 bit color. quality 100, bitrate settings at 3,000 kbps per second
This produces black bars on the left and right of the screen. I'm not sure how to "force" quicktime player to play in widescreen.
The only setting on my camera still leaves bars on the left and right hand side. I'm using NTSC-HDV-HDV 720p 30. That widescreen is wider than what my camera records at.