Send recorded video using getUserMedia through form without using FormData

I have a form where users can record themselves with their webcam using getUserMedia, and I need to send the file they record to another page before saving the file to the server.

My question is what would be the best way to do that? So far I’ve generated a blob of the video, how do I send this through my form to the next page so I can access the file and then store it on the server?

Currently I’m generating the blob like so, which works:

let videoURL = window.URL.createObjectURL(blob, {autoRevoke: false});

But I’m not sure how I can send this file as part of the form’s POST request without using AJAX and FormData. Is it even possible or am I approaching this incorrectly?