Hi,
We have sample rootfs. Please check the section in developer guide
You can develop your rootfs on Jetson Nano developer kit based on the sample rootfs. And for ruuning an application at startup, please refer to
Jetson Nano FAQ
Q: How to autorun an app or commands at startup?
And for capability of Jetson Nano, please check module data sheet:
https://developer.nvidia.com/embedded/dlc/jetson-nano-system-module-datasheet
If Jetson Nano may not be able to achieve target performance, you may considuer use Orin NX or Orin Nano.