So following is lines of output before my application aborted.
INFO:root:open '/dev/snd/pcmC0D0c' failed (-2)
WARNING:root:alsa_open_r: Error opening PCM device default
INFO:root:Stun packet sent for session [0x17356e8]
INFO:root:Using permissive algorithm
INFO:root:Stun packet sent for session [0x1747060]
INFO:root:Using WebM Project VP8 Encoder v1.3.0
INFO:root:Using the default video configuration list
INFO:root:Limiting bitrate of video encoder to 1500000 bits/s for stream [0x75590fd8]
INFO:root:Video configuration set: bitrate=1500000bits/s, fps=12.000000, vsize=352x288 for encoder [0x7554fca8]
INFO:root:Driver is bm2835 mmal, version is 201230
INFO:root:format MS_YUV420P : max_fps=90, native=1, compressed=0
INFO:root:format MS_YUYV : max_fps=90, native=1, compressed=0
INFO:root:format MS_RGB24 : max_fps=90, native=1, compressed=0
INFO:root:format MS_MJPEG : max_fps=90, native=1, compressed=1
INFO:root:Candidate: 0
INFO:root:MSAudioMixer [0x7555e7b0] is entering bypass mode.
INFO:root:alsa_open_w: opening default at 8000Hz, bits=16, stereo=0
WARNING:root:alsa_set_params: periodsize:256 Using 512
INFO:root:V4L2: selected format is MS_YUV420P
WARNING:root:alsa_set_params: period:8 Using 8
INFO:root:alsa_open_w: Audio params set
INFO:root:Size of webcam delivered pictures is 352x288. Format:0x00000001
INFO:root:Output video size adjusted to match camera resolution (352x288)
INFO:root:Video configuration set: bitrate=300000bits/s, fps=18.000000, vsize=352x288 for encoder [0x7554fca8]
INFO:root:Setting sent vsize=352x288, fps=18.000000
INFO:root:Video configuration set: bitrate=300000bits/s, fps=18.000000, vsize=352x288 for encoder [0x7554fca8]
INFO:root:ms_filter_link: MSV4L2Capture:0x7554f718,0-->MSPixConv:0x7558c058,0
INFO:root:ms_filter_link: MSPixConv:0x7558c058,0-->MSTee:0x7558fa58,0
INFO:root:ms_filter_link: MSTee:0x7558fa58,0-->MSSizeConv:0x7554f830,0
INFO:root:ms_filter_link: MSSizeConv:0x7554f830,0-->MSVp8Enc:0x7554fca8,0
INFO:root:ms_filter_link: MSVp8Enc:0x7554fca8,0-->MSRtpSend:0x7554d7b0,0
INFO:root:ms_filter_link: MSTee:0x7558fa58,2-->MSJpegWriter:0x75595910,0
INFO:root:Using WebM Project VP8 Decoder v1.3.0
ERROR:root:no such method on filter MSVp8Dec, fid=16389 method index=7
CRITICAL:root:No video display filter could be instantiated. Please check build-time configuration
Aborted