Depending on the device model, the video resolution of the camera app can be set on the Huawei smartphone. This option
can be accessed in the camera settings after selecting the Video mode. According to the Huawei device and its hardware, the following options are available:

Android 10 | EMUI 10.0
Step 1:  Open the  Camera app
Step 2:  Open the  Settings
Step 3:  Tap on  Resolution
Step 4:  Set the  Video resolution
  1. Open the Camera app
  2. Open the Settings
  3. Tap on Resolution
  4. Set the Video resolution

Huawei Instructions