2 themes in one website? please help

Hi, I wanted to install wordpress on my website and add 2 different themes. One theme will be the backbone for my website. Then i want to have a “videos” section with a different theme to better organize my videos. I was wondering how I could do this. Can i have it under for example “www.website.com/videos”? or maybe something like “www.videos.website.com”?

I’ve been looking for this answer all over the place but i can’t find anything. If this question has already been asked somewhere then please redirect me to it. Thank you!