Your iPhone already comes with everything you need to capture great video. The internal microphone is not the best though. The Saramonic Micro-Shotgun Lightning Microphone is an external microphone for livestreaming and vlogging. It comes with a Lightning connector with built-in swivel.
The SmartMic5 Di features a 2.36 x 0.43″ tube. Its integrated shock prevents capturing unwanted vibration and handling noise. This little microphone is ready for TikTok, Instagram, and other livestreaming platforms.