add a way to enable/disable video effects via libvlc
Currently, enabling/disabling video effects is done running var_setstring to vout (e.g. var_SetString( p_vout, "video-filter", "invert"); ), except this (and vout) isn't available from external apps using libvlc (like the photobooth exemple).
It would be necessary to add a way to enable/disable video effects via libvlc.