This video is either unavailable or not supported in this browser. (Error #4000)
Linux x64, Firefox.
If your system cannot play the video, then this is the correct message. Apparently, you are missing some video codecs that you need to install if you expect to view this video and others like it. At a guess, I'd say that you do not have the AVC (Advanced Video Codec) installed. Use ffprobe to verify.
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,bt709), 1920x1080 [SAR 1:1 DAR 16:9], 5955 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler