Can I shoot HD in Canon 7D?

Yep - you sure can.  We shot a feature with 3 of them last year.  You’ll just want to transcode the footage before you start editing (h.264 is a pain to edit in)

@DianeGaines - You need to define a little more clearly what you mean by ‘quality’.  A 7D with high quality lenses produce a great quality image.  That said, it’s not a RED 5K image, but it really depends on what you’re doing with it.