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That depends on several factors...
How big is the room/area ?m x ?m it's hard to tell in the darkened image. How many cameras? showing 4, is that all you are going to use? Looks like possibly 3m x 3m capture
volume by floor grid? Looks like your room space is adequate and cams I can see are at least 2m from edge of volume, those 2 look at a good height.
2m from the edge of the edge of the marked volume would be the minimum at chest height positioning.(at that distance though, you will possibly loose some upward travel
amount of arm extension or jumping). 3m is better if you have the space, but not more than 7m x 7m total area at the below heights, higher cameras can be moved in closer to
the actor center a bit to look more downward on actor.
1.5m to 2m off floor and one or two high cameras works well all around, depending on placement ability. (use a bit different height for each camera).
For smaller rooms, if you position cameras higher you will get more volume, and upward height capability, 1 camera should always be positioned higher (2.4m to 3m) and a bit
closer to actor for better foot contact/ankle position on floor tracking. If only 4 cams and all higher, you could possibly affect some aspects of the tracking, like
the shoulders or hip rotations.
I use a 4 camera set up, 2 facing the actor crossing view, (1.5m/1.85m), 1 behind the actor square with actor, (1.52m), and 1 high, (2.42m), and on the side of the actor a
bit closer to actor to just capture mostly mid-spine down for better foot/ankle position and hip rotation tracking.(works better for body to floor contact also).
My area is 7m long x 4m wide with 2.5m ceiling, capture volume of 2.5m x 2.5m or so.
Try different camera positioning to see what works best for what you want to achieve.
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