Before entering the video chat, make sure that you allow viewing your camera.
Initially all ladies are forbidden to watch a man's video stream. You allow viewing for each lady individually. Until you allow the lady to see your camera, she will not see you in the video chat.
To allow viewing of your camera, first, click on the "Contacts" button.
After that, you will see a window with your contacts and a camera window. Above the camera window there will be an inscription stating that your camera is prohibited from viewing and the button "Click to allow".