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This is only a partial answer to the question of how to display the GPS and speed data. The metadata file is a text file which can be examined and displayed as a list of speed and position against time. That does not give you the integration with the video but for 40 secs of recording would be enough to correlate in the event of an accident or similar.
The following are a couple of entries from my 2019 330e:
[
{
"VIN":"WBA5X72010xxxxxx",
"entries":
[
{
"id": 1,
"date": " 7.03.2020",
"time": "16:31:36",
"velocity": 89.11,
"latitude": 0.0000,
"longitude": 149.0880
},
{
"id": 2,
"date": " 7.03.2020",
"time": "16:31:36",
"velocity": 88.95,
"latitude": 0.0000,
"longitude": 149.0880
}
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