Function vkCreateVideoSessionKHR 

pub unsafe extern "system" fn vkCreateVideoSessionKHR(
    device: VkDevice,
    pCreateInfo: *const VkVideoSessionCreateInfoKHR,
    pAllocator: *const VkAllocationCallbacks,
    pVideoSession: *mut VkVideoSessionKHR,
) -> VkResult

Available if built with prototypes.