This is what I got for

go run . -rtbufsize 100M -f dshow -i video="Integrated Webcam" -pix_fmt yuv420p -c:v libx264 -bsf:v h264_mp4toannexb -b:v 2M -max_delay 0 -bf 0 - < SDP

Connection State has changed failed

Peer Connection State has changed: failed

Peer Connection has gone to failed exiting