Function set_video_chat_default_participant 

pub async fn set_video_chat_default_participant(
    chat_id: i64,
    default_participant_id: MessageSender,
    client_id: i32,
) -> Result<(), Error>

Changes default participant identifier, on whose behalf a video chat in the chat will be joined

Arguments

• chat_id - Chat identifier
• default_participant_id - Default group call participant identifier to join the video chats
• client_id - The client id to send the request to