Head/Vision Tracking At the 1:20 mark of this video, the author incorporates a line of sight marker to track the players line of vision. Any suggestions on how he did this? What software he might have used, etc?

I want to try and reproduce in some of my own videos.


                
            

Thank you.
It doesn't really look like it is actually being tracked.  It looks like a manual overlay of a line on to it based on the head movement.  It really doesn't look particularly accurate either from what I can tell.  Something like Adobe After Effects (paid) or Black Magic's Fusion (free) can easily be used to accomplish this, though they do both have a learning curve.