What's the best way to build a multiplayer VR game with real-life avatars?

I'm a game developer for 10 years and I've built and launched Squatopia in 2024 using Unity. 

I've seen Mark Zuckerberg's 2026 Connect Keynote speech and it wowed me how he was able to see Boz's full body in VR. I was wondering if we can incorporate that into Squatopia's sequel: Squatopia 2, which will be my entry for Meta VR Start program.

This is my first time building a multiplayer game and I was wondering where best to start and if my idea of real-life avatars is even possible.

I'm taking inspiration from Gorilla Tag for multiplayer aspect, and Hades for the rougelike mechanics. Locomotion will be custom-built hand-tracking.