This message was posted on behalf of Intel Corporation
Thank you for contacting us.
There have been a lot of projects using the Edison, some of them are in this community and some aren't, these are some basic projects using the Edison:
You can also use OpenCV on it: https://software.intel.com/en-us/articles/opencv-300-ipp-tbb-enabled-on-yocto-with-intel-edison, but the Edison doesn't have a multimedia processor or screen that could allow you to show the image on it, so some functions are not available. This is a good guide: http://www.instructables.com/id/Getting-Started-With-OpenCV-and-Intel-Edison/
About the audio, it is possible but you will need extra hardware to make this possible, as a recommendation use this audio guide as a reference: http://www.intel.com/content/www/us/en/support/boards-and-kits/000005983.html
I hope you find this information helpful.
Have a nice day.