This patch's demo is shown in this Youtube video.
In this patch, the user can
two fingers slide horizontally: rotate along the local x-axis
two fingers slide vertically: rotate along the global z-axis
SHIFT+ sliding of two fingers: pan the viewport
pinch in or stretch out two fingers: zoom
The gestures for a touchpad plus~
rotate two fingers: rotate along the local z-axis
slide three fingers to pan the view.