This is a very interesting video, shot by Dom Esposito. In this video Esposito demonstrates the 4K video recording capabilities. The footage you will see in the video comes directly from the iPhone 7 and was edited in Adobe Premier.
These are the hardware tools he used:
RetiCam Smartphone Mount
Manfrotto MT190XPRO3 Tripod
Manfrotto MVH500AH Fluid Head
Joanne Carter BA (Hons), ARPS is a British photographer, photography journalist, editor and curator, and the founder and editorial director of TheAppWhisperer.com, an independent international photography publication established in 2009.She holds a First Class Honours degree in Photography and is an Associate of the Royal Photographic Society (ARPS).Her journalism, criticism and editorial work have appeared in The Times, The Sunday Times, The Guardian, Financial Times, BBC, Vogue Italia, LensCulture, Popular Photography and NikonPro, among other international publications.Through TheAppWhisperer, she brings together academic knowledge, professional photographic expertise and more than 17 years of specialist editorial experience to examine contemporary photography, mobile imaging, computational photography, photographic applications and emerging imaging technologies.