Added USB webcam & Displayport scripts

scripts/usbcam_to_dp/dp_display_480p.sh

+
+### Set the display resolution to 480p
+export DISPLAY=:0.0
+xrandr --output DP-1 --mode 640x480
+xset -dpms
+modetest -D fd4a0000.zynqmp-display -s 42@40:640x480-60@AR24 &
+sleep 1
+modetest -D fd4a0000.zynqmp-display -w 39:alpha:0

scripts/usbcam_to_dp/face_person_detect.sh

+gst-launch-1.0 \
+  v4l2src device=/dev/video0 ! \
+  video/x-raw, width=640, height=360, format=YUY2, framerate=30/1 ! \
+  queue ! \
+  videoconvert ! \
+  video/x-raw, format=BGR ! \
+  queue ! \
+  vaifacedetect ! \
+  vaipersondetect ! \
+  queue ! \
+  videoscale ! \
+  video/x-raw, width=640, height=480 ! \
+  fpsdisplaysink video-sink="kmssink bus-id=fd4a0000.zynqmp-display plane-id=38" sync=false fullscreen-overlay=true
+