Stm32 timer TIM1_CH1 output pulse counter or Freq measurement of TIM8 using TIM8_ETR input

I am using stm32h743i-eval for finding timer8 pwm frequency and duty cycle using TIM8_ETR input from timer1 PWM at 4MHz generating at TIM1_CH1 and measuring pwm Freq and duty cycle at TIM8 using TIM8_