I really like the new features of adding "traj_start/end_marker" in plot_measurement_setup and have some more ideas on this matter:

a) can we also implement a color for start/end markers? Currently they are always in red (or I just not find a way to change it)

b) I often plot the positions of pedestrians at a certain frame. I don't know if others do this as well, but it might therefore be nice to add an option to plot position markers at a given frame (like the start/end markers but at a certain frame)