Replaced example video and updated references

[jay-lee-code]

I found a short clip of someone viewing the ocean. I tried to find something without overly annoying audio and I tested with VLC, Firefox, and Chromium. It's 7 seconds long and the file size is 20.2 MB (20183242 bytes). If that is too large or the video is not what you were looking for, I can try to find something different.

I also renamed all the references to desert.mp4 that I could find to beach.mp4.

[clabe45]

Thanks for contributing! The new video, code changes and updated readme look great. There are a few stale references to desert.mp4 in examples/application though. Also don't worry about the failed checks - the CI system recently broke, so it will fail every time.

[jay-lee-code]

Whoops, sorry. I think I changed all of the old references this time.

[clabe45]

Thanks, merging!