How to get pillar box on output

[w8bbx]

I have a VCR tape that I have been converting, but all the people look fat. I notice that old TV programs are pillar boxed. Can I get OBS to pillar box the output?
I will appreciate detail, because I can barely get around OBS. Copying is my best mode.
Thank you

 

[w8bbx]

Thirty four people have watched this, but no reply.
It it only my problem?
Were my people fatter that I remember?
Why are cars wider than I remember?
If OBS can't pillar box, then what program can?