We are using L4T21.5 in Jetson-tk1 board.
In that “omxh263enc” plugin not present.
Following plugins are present:
gst-inspect-1.0 | grep omx
omx: nvoverlaysink: OpenMax Video Sink
omx: nvhdmioverlaysink: OpenMax HDMI Video Sink
omx: omxvp8enc: OpenMAX VP8 Video Encoder
omx: omxh264enc: OpenMAX H.264 Video Encoder
omx: omxmpegaudiodec: OpenMax MP3/MP2 decoder
omx: omxaacdec: OpenMax AAC decoder
omx: omxwmvdec: OpenMAX WMV Video Decoder
omx: omxh263dec: OpenMAX H.263 Video Decoder
omx: omxmpeg2videodec: OpenMAX MPEG2 Video Decoder
omx: omxvp8dec: OpenMAX VP8 Video Decoder
omx: omxh264dec: OpenMAX H.264 Video Decoder
omx: omxmpeg4videodec: OpenMAX MPEG4 Video Decoder