NVIDIA Broadcast app relies a lot on Ray-Tracing features, hence it only works on the NVIDIA RTX graphics card (not the GTX graphics card). You'll also need a good system (8-Core CPU with 16 GB RAM or higher), plus the most recent graphic drivers, as they're very essential for this app.
Here's the full system requirements for NVIDIA Broadcast app (taken from the official site). The latest Broadcast app version, I think, it's 1.4.0:
Platform: Windows 11 64-bit (older Windows OS are NOT officially supported).
GPU: NVIDIA GeForce RTX 2060, Quadro RTX 3000, TITAN RTX or higher.
RAM: 8 GB RAM or higher (though, I recommend using 16 GB of RAM to avoid memory leaks).
CPU: Recommended: Intel Core i5 8600, AMD Ryzen 5 2600 or higher
Driver: NVIDIA Studio Driver 526.98, Game Ready Driver 526.47, NVIDIA RTX Enterprise Driver 526.67, and above.
Internet connectivity during installation.