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Is it possible to have a custom Blender camera shape?

Like when rendering, the camera image outputs as a "triangle" shape? Or a polygon shape?

Is there a trick to making a custom picture shape without actually rendering a rectangle or a square?

The reason I am wondering is because this tutorial shows how to do it in OBS studio. So it might be possible to do in Blender.

If you know an answer, please share. I would really like to know.

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Your rendered video will always be rectangular.
But you can add a mask over it, using the compositor

  1. Create a black and white image using Blender/Photoshop/whatever
  2. Add an RGB node, using the Mix node
  3. Connect your BW image into the FAC input

How to connect a mask in compositor.
The RGB node changes the background color.

enter image description here

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    $\begingroup$ Or you can use a holdout shader as mentioned in my comment, which also saves render time. $\endgroup$ – brockmann Feb 8 '20 at 18:34

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