nv3dsink
Page 15 I read :
The sink supports setting a specific window position and dimensions using the properties shown in this example:
nv3dsink --window-x=300 --window-y=300 --window-width=512 --window-height=512"
It did not work for me with jetson nano
This worked:
nv3dsink window-x=300 window-y=300 window-width=512 window-height=512