On 11 February 2012, protests were held against ACTA in more than 200 European cities. On 21 February 2012, a news report noted that many countries in Europe that have signed the treaty have set aside ratification in response to public outcry, effectively hampering the ratification and implementation of the treaty..
Speaker volume to adjust the sound. Slide the pointer up and down for volume, or select the speaker icon at the top of the volume control to mute your speaker. Select the Video button to add video to a Skype for Business call. Select the IM button to add instant messaging to a Skype for Business call.
You could try to get your skype stream on a media player like vlc and then flip the video stream in the media player. There is an option of specifying to and from PORTs in skype ,check this link. This tutorial explains you how to flip a video on vlc. I hope this helps you although i am not very sure of the results.