If you are wondering whether can should be capitalized when using title case, you are probably thinking about the verb can, and not the noun. When used as a noun, can is of course capitalized:
A Can of Worms
But the same applies when can is used as a verb, because all verbs are capitalized in title case, including auxiliary verbs like do, can, or have. That is something the various style guides all agree on. Here are a few examples:
All You Can Eat
You Can Leave Your Hat On
Anything You Can Do I Can Do Better
Did you know that this site has a free title capitalization tool that will automatically convert your titles for you?