You did install IGEL Universal Desktop OS 2 on not fully supported hardware using IGEL Universal Desktop Converter 2. Multimedia acceleration is not working within a VMware Horizon View session.
The graphics chip of your hardware is not supported and as a fallback the VESA mode is used.
There is no other solution to the problem than using fully supported hardware. Information on supported hardware can be found in the UDC2 manual.
You can also access IGEL's 3rd party hardware support database to find fully supported graphic chips.