I'm new to blender, and I will surely have many questions in the weeks to come. This is a visual platform, so I like to use screencap video to show my points. Is it OK to post links to SWF videos from something like Jing?
The only moving images supported as part of the post are Gif, and have to be under 2mb. No other video format is supported (thankfully!).
For other formats, or longer videos, you can add links to other hosts as part of the text in your post.
Few things to keep in mind:
Your question in BSE should have a clear explanation of the issue you want to resolve as text and should be understandable besides the video. Don't just post: "watch this video and tell me how to fix it".
Think of video as additional support to clarify the issue.
Please keep all videos short and to the point. Don't expect people to watch for a long time while you ramble on. Concise and clear questions get better answers.
Also please take some time and read the help section to familiarize yourself with the site and understand the rules: https://blender.stackexchange.com/help