Xiaomi POCO F1, Mi 8, and Mi 8 Pro latest MIUI beta update brings 4K 60fps video recording and more Xiaomi has been constantly updating MIUI to keep up with the trends worldwide and it recently introduced a system-wide dark theme on the MIUI 10 Global ROM to make it similar to Android Q. And now it seems that the Chinese OEM has introduced support for 4K video recording at 60fps on the Xiaomi Poco F1, the Xiaomi Mi 8 and the Xiaomi Mi 8 Pro. These have been added as part of the new update on MIUI 10 Global Beta 9.3.1
– https://www.xda-developers.com/xiaomi-poco-f1-mi-8-pro-4k60fps-video-recording-miui-beta/

Source: https://www.youtube.com/watch?v=RptLsvaYQY8