The 12G-SDI Audio Embed/Extract Reference Design provides an application example for embedding and de-embedding of digital audio data into a 12G-SDI video signal.
The design example may be found in the Intel FPGA Design Store at https://fpgacloud.intel.com/devstore/platform/20.1.0/Pro/12g-sdi-audio-reference-design/
The attached "12G-SDI Audio Reference Design User Guide.pdf" provides more details on using the design example.