I just created a demo of the nostr HLS playback.
https://github.com/1l0/video_testbed
The key point is that you can use a data URI to play the .m3u8 on the fly.
nostr:nevent1qvzqqqqqqypzqun2rcnpe3j8ge6ws2z789gm8wcnn056wu734n6fmjrgmwrp58q3qy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qgwwaehxw309ahx7uewd3hkctcqypdr9ypft4xck29kjm2dz0lrl2fffdnlvu4hxrwxw62nd9aeda4vgwqjn50