Does the NIOS IDE 8.1 has the Microc/SO-II Toturial?

Any of two projects should be a good start point to develop your own uC/OS-II application. I don't remember about template included in Nios II IDE 8.1, however in case of Nios II IDE 9.0 project "Hello MicroC/OS" creates two threads:

# include <stdio.h>
# include "includes.h"
/* Definition of Task Stacks */
# define   TASK_STACKSIZE       2048
OS_STK    task1_stk;
OS_STK    task2_stk;
/* Definition of Task Priorities */
# define TASK1_PRIORITY      1
# define TASK2_PRIORITY      2
/* Prints "Hello World" and sleeps for three seconds */
void task1(void* pdata)
{
  while (1)
  { 
    printf("Hello from task1\n");
    OSTimeDlyHMSM(0, 0, 3, 0);
  }
}
/* Prints "Hello World" and sleeps for three seconds */
void task2(void* pdata)
{
  while (1)
  { 
    printf("Hello from task2\n");
    OSTimeDlyHMSM(0, 0, 3, 0);
  }
}
/* The main function creates two task and starts multi-tasking */
int main(void)
{
  
  OSTaskCreateExt(task1,
                  NULL,
                  (void *)&task1_stk,
                  TASK1_PRIORITY,
                  TASK1_PRIORITY,
                  task1_stk,
                  TASK_STACKSIZE,
                  NULL,
                  0);
              
               
  OSTaskCreateExt(task2,
                  NULL,
                  (void *)&task2_stk,
                  TASK2_PRIORITY,
                  TASK2_PRIORITY,
                  task2_stk,
                  TASK_STACKSIZE,
                  NULL,
                  0);
  OSStart();
  return 0;
}