Hi, I think you should take a look into frappe builder
For server requirements, you can take a look into Basic System requirements guidance on self hosted setup - #6 by bkm
Regarding videos/photos if you follow the good pratices for SEO, they dont will need a lot of resources!
Also, try to host your videos in youtube (private) and use a share-link to embed into the website, it guive you 2 prós:
1 - Save server resources
2 - capture views for free