In general - Is posting vlogs to Reddit risky? YES. Posting ANYTHING to Reddit is risky. But high risk means high reward if you do it right.
For starters, in all honesty, there isn't much point in posting to subreddits like vlog, vlogs, or youtubers. Those simply serve as a dumping ground for everybody to come and unload their link. Notice how all the posts hover around the default 1 upvote mark and have no comments or interaction otherwise.
You want a major subreddit, where people will actually interact. As mentioned, r/funny is basically all pictures. What would make more sense is r/videos. But when it comes to major subreddits, your posts typically have to filter from the new category, to rising, to a few pages deep in the hot category. And it needs to be well received by the people that are browsing each of those. The people that browse the new and rising categories are extremely critical of content. So what you've made needs to be top notch to make it through those before it reaches the much wider and less critical audience.
As also mentioned, Reddit advises against self promotion. Many subreddits also have a filter that will hide your posts if more than 10% of them link to an individual channel. Keep that in mind so that you don't spam. Contribute to the respective communities with comments and posts and it shouldn't be a problem.
Give it a try and see what happens. Good luck.