Marrying anyone in Skyrim. almost.
How to marry anyone (almost) in Skyrim
Find the NPC in question. Press the ` key (top left of the keyboard, under ESCAPE)
click on the NPC so that their ID appears in the middle of the screen
type "addtofaction 19809 1"
then, so long as you're wearing an Amulet of Mara, and the NPC has a high enough disposition, there will be an option to marry them.
I've found a few potential exceptions. First, obviously, is Children, second seems to be any of the 'special' NPCs, that are uniquely voiced. Like Colonel Tigh, erm, I mean, General Tullius, and Ulfric Stormcloak.
and yes, you can use this to marry Lydia. As shown in the video.
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The Elder Scrolls V: Skyrim Statistics For Big The Dave
At present, Big The Dave has 97,672 views spread across 7 videos for The Elder Scrolls V: Skyrim, with the game making up 1 hour of published video on his channel. This is 2.60% of the total watchable video for The Elder Scrolls V: Skyrim on Big The Dave's YouTube channel.