Devices
You can use mobile, laptop or desktop with camera and microphone. You need to allow permission to use camera and microphone during the interview.
Environment
Stay in no or low noise environment. If practicing during the night time, keep the room lights on.
Internet Bandwidth
For video interview, you need to be connected a good internet bandwidth. Low internet bandwidth will impact the interview quality and interview analysis assessment.
Body Language - Sitting Posture
During the interview, sit properly in the chair, front facing the camera. See in the camera.
Audio - Voice
Use good voice like you will communicate in your viva exams, or interview, or group discussions.