I have opened an .obj file in blender and want to see its different view and create a video of it minus the black screen behind it. How can I do so in OSX?
There's no built-in way to export as a gif, but you can get most of the way there. Simply animate or setup your camera angle, and save the render as a JPG (or some other lossy image format). I'm guessing you want an OpenGL-esque simple render, so switch the render engine to Workbench (that'll remove the overlays automatically). Once you have your images, you can use ezgif.com or some other application to convert your image sequence into an animated gif.