When you are doing a face-to-face interview, the advice is always to make eye contact with your interviewer(s). The same advice applies to virtual interviews or online interview. For interviewers like me to feel that you are making eye contact with us, you need to be looking at the camera of your phone, laptop or tablet. It is easy to be distracted by the people on the screen, yourself included! But if you are looking at yourself or looking at the interviewers on the screen, it will not look to them as though you are looking them in the eye. The way to do this is to look at the camera. This does not come naturally to us, to engage with the machine rather than with the people on the screen. But you want to come across as you would if you were meeting them in person, so remember that you make eye contact by looking at the camera. It is worth practicing, because it comes across to your interviewers quite differently whether you are looking at the camera, or not. This video on my facebook page shows you what I mean.
My interview tips are based on my years of interviewing experience and my years of interview coaching. I hold qualifications in HR and Business Psychology.