You can do something like below,
public static class Function1
{
[FunctionName("Function1")]
public static async Task Run([EventHubTrigger("samples-workitems", Connection = "EventHubConnectionString")] EventData[] events,
[DurableClient] IDurableOrchestrationClient durableOrchestrationClient,
ILogger log)
{
// Other Code
await durableOrchestrationClient.StartNewAsync("DurableFunction", events);
}
}