USB HID mode

Hello
Is It possible to write Custom USB descriptors for Device(openMV) to combine HID mouse and HID keyboard ???

No that’s not supported.

Hi Umang. Take a look at the Teensy board. It has support for simultaneous HID Mouse + Keyboard.
You could send have OpenMV do the Vision part and then send the data to the teensy via I2C or CAN and let the Teensy do the HID part.