Hi,
So I did the video interview last week. It consists of 4 question. You are given 1 minute thinking time and 1 minute to answer.
The questions were a mix of competency, strength and motivational questions. The questions are different for every time so I would prepare for general competencies, strengths, why (commericial) law and why CMS. If you do research and draft answers, that would go a long way. However, be cautious with this and DO NOT just memorise and read off a script. Make it natural. One way I did this was by using virtual post it notes on the computer screen (you can download apps online or from the stores). I wrote key words (only a few) for the points I was going to make during the thinking time and since it was next to the camera, it did not look like I was looking away. Other people use physical post it notes instead or even normal paper on the side, so choose whatever method you find comfortable. Practicing this first, would help.
Do the interview somewhere quiet that you won't be disturbed. Make sure the background is clear and the room has good lighting. Make the background as professional as possible.
Act natural in a video interview. I realise it is difficult but maintain eye contact by looking at the camera. Be careful to not stare too strongly, so look away occasionally aswell. Make sure to smile. Smile at the start of the recording, and try to hold it if you can. If you can't, then don't worry too much. The important bit is to act natural and remain calm.
Speak loudly and clearly. The time limit can be tight and intimidating but do not talk so fast that the recruiter will not understand you. Additionally, do not waffle and speak extra for the sake of meeting the minute if you do finish the answer under the limit. Just click the stop button. I did do this for one question and believed it was better to than waffling. This all takes PRACTICE.
Dress smartly and make sure your appearence is clean as you would in a physical interview.
For preparation, you should research as you normally would for any interview and practice speaking to the camera. So video record your answers as though you were doing the interview. This will help a lot as you may realise issues with your speech, video quality (camera positioning), timing, appearance etc.
It may seem like a lot to consider when interviewing, but the main thing is to act natural and remain calm.
Best of luck with the interview!