Auto-stretch for webcam NDVI

[rexagod]

We'd like to propose an enhancement that allows infragram to initially spin up a full-width video section that resizes itself depending on the video resolution (should change to lesser widths if resolutions are unclear).

Picked from https://github.com/p-v-o-s/infragram-js/blob/a4a2bacff7202342a68909d58dffbba3f5711515/todo.txt#L10

[rexagod]

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