Customizing Blog Post Header

Site URL: https://www.onekindcreative.com/podcast/emily-jimison-celebrity-makeup-artist-3sf2f-2ga7x-9c42b-g2yyn

I would like to have the headers of the blog posts on my site be full bleed parallax images called from an upload in the edit post window (like alternate social sharing image *see second attachment*). Is this possible? I would also like to have a gradient overlay on the image, the post titles to be white, and the navigation menu to be transparent. I recognize this is some pretty advanced customization, so I have provided an example of what I would like my blog posts to look like. Thank you for your help!