Extraction of overlay data from stored video

[PRADEEP NALAWADE]

How to overlay a text onto the h264 stream and store it using GStreamer 
so that overlay text can be extracted later. I need to extract the 
overlay text from the video.

I am using the following command to overlay text onto the stream and 
store it.

    *gst-launch-1.0 -e imxv4l2videosrc ! textoverlay text="Sample Video"
    valignment=position halignment=position xpos=1 ypos=1
    font-desc="Sans, 20" ! timeoverlay ! vpuenc_h264 ! matroskamux !
    filesink location=video.mp4*

Is it possible to extract the text overlay from the video generated 
using above command? If not, how to overlay a text, so that it can be 
extracted later?

Thanks in advance.

Pradeep Nalawade

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