Permission issue can occur when running the vision apps script incorrectly.  Some observations from Aniket below, along with the attached email

 
This is only relevant when the user does a "make linux_fs_install_sd_ip"
The above command will go through... even multiple times.
 
However after running the command once, the binaries are installed as root since the partition was mounted as root here : https://git.ti.com/cgit/processor-sdk/vision_apps/tree/makerules/makefile_linux_arm.mak?h=main#n277
 
So the next time you remove the SD card and mount on PC directly and try "make linux_fs_install_sd" it gives an error saying permission denied since there it is mounted as the user and tries to remove/replace files that were installed as root previously
 
I think it only requires either a "chmod 777" or "chown user:group" at the "/lib/firmware/vision_apps_evm" folder. That worked for me