The ornamental design for a mountingdevice for a video display monitor, as shown and described.
FIG. 1 is a front perspective view of a mounting device for a video display monitor showing my design;
FIG. 2 is a left side elevation view thereof, the broken line drawing showing the mounting device for a video display monitor to a vehicle seat and with a docking leg attached to a monitor inserted in the mounting device for a video display monitor, being for illustrative purposes only and forming no part of the claimed design;
FIG. 3 is a right side elevation view thereof, the broken line drawing showing the vehicle seat, docking leg and monitor, being for illustrative purposes only and forming no part of the claimed design;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a top plan view thereof, the broken line drawing showing the vehicle seat, docking leg and monitor, being for illustrative purposes only and forming no part of the claimed design; and,
FIG. 7 is a bottom plan view thereof, the broken line drawing showing the vehicle seat, docking leg and monitor, being for illustrative purposes only and forming no part of the claimed design.