How do I track motion on a video with inconsistent track points?

I have a video of a teacher in front of a chalk board. There is one camera motion when the teacher walks from one side of the chalk board to the other. I want to add graphics on the chalk board and make it look like they are pinned on the board. What's the most accurate way to track this motion for my graphics? I'm a real newb to motion tracking and actually haven't been successful at it so this one may take some extra explaining for me.
One think I tried was using the motion tracking behavior and I placed three track points at the bottom left, top left, and top right of the chalk board. I couldn't ad one on the top right because the teacher was in the way and at one point, the teacher walks in front of the bottom left motion track point, confusing it and loosing focus on what it's tracking. Am I making this harder than it has to be or can it be done accurately?
Here are a couple frames to show the (simple) panning from the right of the chalk board to the left. Other than this pan, the rest of the footage is still.

I don't do MAC's, but have you contacted their tech support?
I had this same problem on a PC notebook (TOSHIBA) which didn't have the TILDE key. One program I had needed the TILDE key for a major, often used function. The issue never got resolved.
expeditonwest

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