To make there lives easier:

$1 has information about how to turn on and off audio description with screen-readers. Skip to the first table on the page to read the hotkeys. Basically, turn on forms mode, be focused on the player, and press "d" for audio description, and "c" for closed captions. Murdoch Mysteries would be a good example of a program where most (perhaps all) episodes have audio description. I just finished season 8, and it was available on all episodes. Not sure about the completeness of previous seasons, as I watched them all on TV. But they all had audio description on TV, so I'd be surprised if they didn't online. CBC also doesn't currently make any attempt to block VPNs, as far as I know. Note that all CBC videos require flash.

As far as TVO, they give absolutely no information about audio description or hotkeys on there website, that I could find. However, here is a direct link to an episode with dv:
http://tvo.org/video/programs/hard-rock-medical/ep-1-trouble

TVO does not require flash. You can enable audio description by finding the checkbox labeled "on off" below the "full screen" button. Once you check this box, press the "play" button, and audio description will be enabled. Note that while TVO does not have an iPhone app, opening the TVO website in Safari will allow you to watch videos, and turning on audio description works with voiceover in Safari.