Why is the webcam permissions window with a video size lower than 215*138?

Question

Browsers

I use the video-io plugin to transfer the video stream and I send one of the videos to the rtmp server. According to the layout, it is conceived that the user sees his face approximately 100x80, but since flash movie requires rights to the camera, then you need to set the size to 215x138 at least ..
Everything seems to be ok, you have to put up with it, but jivosite.ru has an audio call that uses an invisible flash movie, and the message about access rights is shown only in the browser. How can I implement the same message