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Follow the suggestion of @joq, these are the commands used to run image_proc nodelets properly:

1)

export GSCAM_CONFIG="v4l2src num-buffers=-1 device=/dev/video1 caps=\"video/x-raw-yuv,width=640,height=480,format=(fourcc)YUY2\" ! ffmpegcolorspace"
roscd gscam
cd bin
rosrun gscam gscam

2)

export ROS_NAMESPACE=/gscam
rosrun image_proc image_proc

3)

rosrun nodelet nodelet standalone image_proc/crop_decimate _x_offset=0 _y_offset=0 _width=638 _height=438  /camera/image_raw:=gscam/image_rect_color /camera/image_info:=gscam/camera_info

4)

rosrun mbn_visualizer mbn_visualizer /image_topic:=camera_out/image_raw