Adobe After Effects can export video tracking points so you can use them anyway you want. The problem is that the points are exported in a legible text format, so if you want to use them in any programming language they are useless. This JS simply parses the text and converts it into a useful JSON.
You just have to make a call to AEParser.parse with all the After Effects text as a unique parameter. The result is the json Object.
The example uses JSON.stringify to output the json, so it may not work in old versions of IE and maybe other ancient browsers.
Adobe After Effects 6.0 Keyframe Data
Units Per Second 23.976 Source Width 1920 Source Height 1080 Source Pixel Aspect Ratio 1 Comp Pixel Aspect Ratio 1
Anchor Point Frame X pixels Y pixels Z pixels 144 1257.13 496.074 0 145 1257.54 498.967 0
Position Frame X pixels Y pixels Z pixels 144 1257.13 496.074 0 145 1257.54 498.967 0
Scale Frame X percent Y percent Z percent 144 100 100 100 145 100.053 100.053 100
Rotation Frame Degrees 144 2.26191 145 2.27979
End of Keyframe Data