Feature Request - telemetry transparency adjustment

Hi,
I use UDP video stream for FPV flights, but telemetry graphic (HUD) is really too distractive and covers too much picture area to have comfortable video perception.

It will very much help if HUD can be switched off, or better transparency adjusted from 0 to 100%.
This can exclude user Items, as they can be switched off individually.

Start by locating the Mission Planner entry point responsible for the UDP video stream and telemetry HUD, then inspect how individual user items are currently toggled. Done means the HUD can be disabled or given an adjustable transparency from 0 to 100%, without changing the separate controls for user items.

Written by the indexing model from the issue text.