Here the network trace pertaining to this screencast:
dump_210214_2100_gdO.pcap

From that screencast you can recover the video that I uploaded in that
session to Open.Tube.

View from 1:20. You can see a file is named:
VID_20201105_zov_svjedoci_x265_ALL.mp4
in my computer, and you can see I chose that file to upload it to
Open.Tube.

Now, you can open the trace in Wireshark, give it the:
dump_210214_2100_gdO_TLSKEYLOGFILE.txt
so it can decrypt the TLS and extract http objects into a folder
somewhere. A lot of files will be extracted. The largest one will be
named:
upload
and from byte 1042 it contains that video from the start.

You can also run this command, after you download the files listed
below:

tshark -otls.keylog_file:dump_210214_2100_gdO_TLSKEYLOGFILE.txt \
        -r dump_210214_2100_gdO.pcap -q --export-object http,some-folder

Same as with Wireshark, the largest file will be: upload
Now execute this:
tail -c+1042 upload > VID_20201105_zov_svjedoci_x265_ALL.mp4

That is bit-to-bit undeniably the video file that was at that time in
my computer, which I chose to upload to Open.Tube.