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The issue with camera tracking for the hands positions isn't as straight forward as simply setting the marker on the hand, even with SynthEyes, the tracking will constantly drop out if attempted and you will not get any rotational values for the object tracked without having additional tracking marker point attached to the hand, if the purpose is to add a mesh object, (say an arm mounted weapon), to the hand for a CGI video process.
SynthEsyes, I believe, is one of the only programs that offers multi-camera tracking, most are single camera tracking, but any system you will have to use an additional program to stitch the multi-camera videos together afterwards.
It seems you are getting into more time and effort than it would be to just upgrade your laptop to handle iPi tracking, if your use is for character animations, it would be less time and irritation, and the quality of the tracking is really high quality, although not real-time, but there is no real-time solution I have ever seen that is as accurate as iPi can accomplish in it's cost range of course, with far less glitching and clean up, and even the clean up isn't bad when the camera set up is optimized.
Looking into making your laptop work with the iPi program would seem to be a better choice to me with an Nvidia GTX 970 or better graphics card and a slight RAM increase, if that is within your budget to do, because you aren't going to get very good quality out of free programs available to do the same things differently, with more headaches, more cleaning or paying for other professional tracking alternatives to use, all adding up to $$$ anyway.
Blender does have a really good camera tracker also, but single camera tracking and it's free software and combines many processes in one application, (modeling, animation, texturing, video compositing/editing, audio editing), full range 3D package really, but getting used to it, if never used it, can be a bit daunting, although there are 1000's of YouTube video tutorials on specific features to make it easier to figure out.
If you are just playing around with this as a hobby, I guess that it would make sense to keep it cheap, but if doing it professionally, then you need at least semi-professional hardware and software, or deal with the less than optimal results and more time, which to me adds up to $$$.
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