Right now, I use instagram to post my thumbnails for my newest video and direct people to click on my profile link (which links to the channel). I'm thinking in the future, I will make snippets of the actual video and then direct them to see the rest of the video by clicking the profile link.
This is what I do. On my Instagram, I have a little bit of a mix of content that showcases my personality, but I keep the feed looking consistent and clean. When I export a video, I will choose what I think are the best 30 seconds, or even make a short montage, and post that to my Instagram with a call to action to click the bio link to see the full video. One recomendation I would make for your bio link it to use a link shortener (like bit.ly). So Instead of the link looking like this
https://www.youtube.com/waatch?v=iTI0o7-asdvBFo .... it looks something like this
bit.ly/HowToGetMoreViews <--- Little things like this actually can make a difference. In addition to that, the bit.ly dashboard keeps tracks of how many clicks your links are getting, so you can directly track how much traffic you are sending to your videos from your Instagram. This can be helpful if you are an analytics buff like I am.
With those things being said, it is tough to get people to go from one social media channel to another, so don't expect this to blow your video up... but every little bit helps when you are trying to get your video off the ground.
Feel free to check out my Instagram profile for examples of what I am talking about, the link is in my sig and my username is @leonlush.
All the best guys!