Using my Nikon D3300 as a webcam

Recently, I've been doing a lot more YouTube videos. As I've been getting more advanced in my video production work, I realized that I really needed to up my video quality. I already had a Nikon D3300, but I didn't know how to make it work as a webcam. When I first looked it up, everything I found suggested getting an expensive piece of hardware to capture the HDMI feed and send it to the computer, but I could tell that there was a USB connection port and I suspected that there was a cheaper way to connect my camera to my linux laptop using USB and open source software.