Several ways
a) To buy from me
b) You buy traffic at in at the trusted traffic brokers, make landing page with a link see my sexy webcam
and on that moment that traffic is webcam traffic (don't for get to put other links for other niche)
c) make some great blogs that are targeted to your needed keyword (like webcam, webcam girl, live sex etc)
d
Make a traffic site (tgp, mgp etc ) and trade with the known Webcam traffic sites as livesexlist, livesexempire. etc)