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YouTube links in the video and Channel to your site are all nofollow. I'm not sure if they were ever dofollow, but regardless, it's not a bad link to get to round out a natural looking link profile (plus the links can generate traffic). If your video has a good chance of getting shared outside of YouTube, make sure to put your domain name and/or brand in the video itself so you get attribution and traffic.

I've done a few IG's and an effective strategy is to develop a hit list of blogs and websites that are relevant to your topic, then contact each one with a brief explanation of the infographic and why it's relevant to their audience. Track responses in a spreadsheet and follow-up with folks you haven't heard from 5-7 days later. Keep emails brief, friendly and professional and craft a compelling headline that isn't spammy.

The most important part of the IG is the embed code. Provide it in the emails you send out so people can easily grab it and post to their site/blog. Also, create a page on your site (make sure you post the IG on your site first so Google credits you with the content) that includes the embed code. When people post using the embed code, the result should be your IG, anchor text link back to your site and a link for "Place this graphic on your site". Also, don't forget to register the work on Creative Commons.

Here's a recent example of how it works: http://540seo.com/are-online-reviews-killing-your-business