Allow querying video parameters on streams

[wolfd]

Allows fetching width/height/fps/format on video streams.

Topic: video-metadata

[wolfd]

Reviews in this chain:
└#5 Allow querying video parameters on streams

[wolfd]

#	head	base	diff	date	summary
0	9a06b4fd	d28b0aad	diff	Mar 4 0:27 AM	2 files changed, 76 insertions(+)

[wolfd]

Closing in favor of #1