More robust camera overlap algo

[antoinefalisse]

We should use the examples from this forum post to improve the camera overlap algorithm. It is not obvious why it fails after visually observing the results of pose estimation.

https://simtk.org/plugins/phpBB/viewtopicPhpbb.php?f=2385&t=16601&p=0&start=0&view=&sid=589084b0b163c652ea0a99849ef1f650